The study of the functional changes that occur in the body as a result of injury, disorder, or disease.
Pathophysiology
The study of changes in cells and tissues as a result of injury or disease.
Pathology
The mechanisms of human body functioning.
Physiology
How the human body is put together, including the component parts operate together.
Structure
Concerned with how these component parts operate together.
Function
The functional impairment of cells, tissues, organs, or organ systems.
Disease
A specific condition with a recognizable, predictable pattern.
Syndrome
The disease beginning.
Pathogenesis
Vulnerabilities
Risk factors
Precise cause of disease.
Etiology
Disease-causing microorganism
Pathogen
Having more than one genetic and/or environmental causing events
Multifactorial
When a disease has no known etiology
Idiopathic
The result of exposure to infection in the health care environment
Nosocomial disease
Diseases that are the inadvertent result of medical treatment.
Iatrogenic disease
The presenting signs and symptoms of the disease
Clinical manifestations
Indicators that are reported by the ill individual and are considered the "subjective" manifestations.
Symptoms
Triggers
Precipitating factors
The manifestations that are found directly at the site of disease and are confined to that specific area
Local manifestation
Manifestations that present throughout the body and are not confined to one area
Systemic manifestations
Manifestations or diseases that begin abruptly and last a few days to a few months.
Acute manifestations
Diseases that generally last longer than 6 months and are insidious in onset
Chronic diseases
Gradual
Insidious
Symptom-free periods
Remissions
Flaring of symptoms
Exacerbations
A term used to describe diseases that fall somewhere between acute and chronic in duration and severity.
Subacute
The person does not have any noticeable symptoms even though diagnostic tests may indicate that the disease is present
Asymptomatic
Label for the disease
Diagnosis
The human response to illness, such as altered fluid balance and ineffective airway clearance
Nursing diagnoses
The forecast or prediction of how the individual will proceed through the disease process.
Prognosis
A negative outcome with disease complications that impact the quality of life
Morbidity
Death
Mortality
The perceived wholeness of body, mind, and spirit
Health
A state that results in suffering or distress
Illness
A dynamic balance in the body marked by the appropriate and effective response to stimuli, thereby keeping the body in a steady state.
Homeostasis
The study of disease in populations
Epidemiology
The rate of occurrence of a disease at any given time
Incidence
When the incidence and prevalence of a disease are predictable and stable
Endemic
A dramatic increase in disease incidence in a population
Epidemic
When an epidemic spreads across continents
Pandemic
Prohibits a disease condition from occurring
Primary prevention
The early detection and treatment of disease through screening
Secondary prevention
Rehabilitation of a patient after detection of disease.
Tertiary prevention
A general idea that can be applied to similar situations
Concept
The third line of defense
Immune response
Defined in the broadest sense to include any form of damage or alteration to cells or tissues
Injury
To increase blood flow to the site of an injury
Vascular response
To alert the products of healing to attend to the site of injury
Cellular response
Widen
dilate
Loosens
Permeable
Form a tight junction within the inner lining of the blood and lymphatic vessels and the heart
Endothelial cells
The outer membrane of the vessels, which separates the vessel from the tissues of the body
Basement membrane
The process of engulfing and removing harmful agents
Phagocytosis
Watery fluid
Exudate
Facilitate the process of widening and loosening of the blood.
Inflammatory mediators
Leukocytes that are housed throughout the connective tissues of the body and near all blood vessels
Mast cell
When the mast cell breaks apart and releases inflammatory mediators in the form of extracellular granules (grain-like particles)
Degranulation
A white blood cell that also contains granules
Basophil
More than a hundred distinct cell proteins most often found within white blood cells that have a vital role in regulating inflammation
Cytokines
A complex lipid stored in cell membranes, including those of endothelial cells that line blood vessels and in many other types of cells that can become injured
Platelet-activating factor
A substance, derived from the plasma membrane of an injured cell, which generates various inflammatory mediators through a complex chemical conversion
Arachidonic acid
A self-attack against body tissues
Autoimmunity
A process of moving certain cells to the site of injury
Chemotaxis
Specific inflammatory mediators
Chemotactic factors
Attraction and binding
Cellular adherence
In this process, cells can move between and through endothelial junctions
Diapedesis
The local manifestations of acute inflammation
Cardinal signs
Redness
Erythema
Enlargement and inflammation of the nearby lymph nodes
Lymphadenitis
An elevation in white blood cells
Leukocytosis
A protective clot and subsequent scab
Thrombus
The layers of architectural structures that support the cells
Extracellular matrix (ECM)
The movement of epithelial cells to form a covering over the wound
Re-epithelialization
Tissues made up of cells with a specific function
Parenchymal tissues
Important cells that produce and replace the connective tissue layer
Fibroblasts
Helps to fill in the gaps left after the removal of damaged tissues
Collagen
Allows stretching and recoil of tissue
Elastin
Regulate cell movement across the matrix, provide a place for the attachment of the cells to the matrix, and prompt the cells to function
Glycoproteins
A temporary matrix that promotes healing by decreasing blood and fluid loss at the site and attracting and supporting fibroblasts, endothelial cells, and epidermal cells.
Provisional matrix
Connective tissue characterized by extensive macrophages and fibroblasts
Granulation tissue
The generation of new blood vessels
Angiogenesis
Healing in response to mild injury with minimal disruption to cells
Resolution
Can occur only in those cells that undergo mitotic division; accomplished through proliferation, differentiation, or diapedesis
Regeneration
Growth and reproduction
Proliferation
Cells mature and become more specialized
Differentiation
Migration of nearby cells
Diapedesis
Cells that constantly regenerate through mitosis, particularly epithelial cells of the skin, GI tract, and urinary tract, and blood cells in the bone marrow
Labile cells
Cells that stop regenerating when growth is complete but can resume regeneration if injured
Stable cells
Occurs in extensive wounds and when regeneration is not possible
Replacement through the production of scar tissue
Cells that do not undergo mitosis and are unable to regenerate
Permanent cells
When the wound is basically closed with all areas of the wound connecting and healing simultaneously.
Primary intention
When wounds heal from the bottom up; process is much slower and more involved than the primary intention process
Secondary intention
Passage of oxygenated blood
Perfusion
Circumscribed, open, craterlike lesion of the skin or mucous membranes
Ulcers
A problem of deficient scar formation, in which the wound splits or bursts open, often at a suture line
Wound dehiscence
Hypertrophic scars that result from excessive collagen production at the site of injury
Keloids
Fibrous connections between serous cavities and nearby tissues, which do not allow the surrounding tissues to move freely
Adhesions
Enzymes that destroy elastin and other tissue components
Proteinases
Nodular inflammatory lesions that encase harmful substances
Granulomas
Phagocytes that can engulf particles much larger than the typical macrophage
Giant cells
Gather and contain smaller substances by forming a wall, or fibrotic granuloma, around the affected area
Epithelioid cells
First-degree burns
Superficial partial-thickness burns
Second-degree burns
Deep partial-thickness burns
Third-degree burns
Full-thickness burns
Areas of thick, shortened, and rigid tissue
Contractures
A state of inadequate perfusion to peripheral tissues
Shock
A bacterial infection of the blood, and septic shock
Sepsis
A thick, coagulated crust
Eschar
A clear fluid that seeps out of the tissue
Serous exudate
A process of mechanically removing debris, including necrotic tissue, from the wound
Debridement
A generic term for degeneration or inflammation of the joints and refers to a group of diseases of varying pathogenesis
Arthritis
Granulation tissue that forms over the inflamed synovium and cartilage as a result of accelerated angiogenesis
Pannus
A condition where fibrosis impairs joint mobility and can result in a debilitating fixation of the joint
Ankylosis
Inflammation of the lining of the stomach, or gastric mucosa, thereby impairing gastric function.
Gastritis
A vague epigastric discomfort associated with nausea and heartburn
Dyspepsia
An abnormal track or passage that forms between two segments of bowel or other epithelial tissue
Fistula
Hidden
Occult
A state where tissue readily bleeds
Friability
The process by which the body recognizes foreign substances and neutralizes them to prevent damage
Immunity
The study of the structure and function of the immune system as well as the phenomena of immunity, induced sensitivity, and allergy
Immunology
A substance that induces a state of sensitivity or an immune response
Antigen
One of the two precursor cell types that include natural killer cells, T lymphocytes, and B lymphocytes
Lymphoid progenitor cells
One of the two precursor cell types that produce other types of cells through the granulocyte/macrophage progenitor which include monocytes, dendritic cells, granulocytes, and mast cells
Myeloid progenitor cells
Cells that mature and fully differentiate in the thymus
T lymphocytes
A type of T lymphocyte that directs destruction of antigen carrying cells
Cytotoxic T lymphocytes
A type of T lymphocyte that enhances humoral and cell-mediated responses of the immune system
Helper T lymphocytes
A type of T lymphocyte that inhibits humoral and cell-mediated responses
Suppressor T lymphocytes
A unique receptor that is able to bind to antigens, promoting a specific immune response
T-cell receptor (TCR)
Lymphocytes that differentiate into plasma cells in the bone marrow; produce and secrete antibodies after contact with an antigen
B lymphocytes
Receptor bound to the cell membrane of the B cell; association with antigen activates plasma cells to produce and secrete antibodies
B-cell receptor
A group of structurally related proteins important in immune function; composed of a variable region promoting antigen specificity and a constant region; classifications include IgG, IgA, IgM, IgD, and IgE
Immunoglobulin
Large, granular lymphocytes; non-specific cytotoxic cells
Natural killer cells
Phagocytic cells named for the cytoplasmic granules common to all types; polymorphonuclear leukocytes, including neutrophils, eosinophils, and basophils
Granulocytes
Granulocyte present in the greatest number; most important in the rapid response to bacterial infection; phagocytic; the first responders in the inflammatory response
Neutrophils
Granulocyte with greatest protection against parasites
Eosinophils
Granulocyte that complements the actions of mast cells; important in establishing allergic reactions
Basophils
Large, mononuclear leukocytes representing 3% to 7% of the total number of circulating leukocytes associated with a prolonged inflammatory response
Monocytes
Large, long-lived phagocytic leukocyte found within body tissues associated with a prolonged inflammatory response
Macrophages
Process and display of antigens to T lymphocytes; take up antigens when they are encountered in the circulation
Dendritic cells
Immature dendritic cells in the skin; carry surface receptors for immunoglobulin and complement, important in the immune response
Langerhans' cells
Sites for maintenance of the lymphocytes; are the organs in which immune responses are often initiated; organs include the spleen, lymph nodes, and other lymphoid mucosal tissue, such as tonsils and the appendix
Peripheral organs
Circulates lymphocytes in lymph fluid; work in concert with the blood vessels to promote an effective immune response
Lymphatic system
Filtration product of extracellular fluid from tissues
Lymph fluid
Joined segment of lymphatic vessels
Lymph nodes
Lymphocytes that have not yet encountered an antigen
Naive lymphocytes
Responsible for early, rapid response to pathogens without prior exposure
Innate immunity
Cell-mediated and humoral immunity; specific immune response occurring during a lifetime
Adaptive immunity
Cells that process and present antigen for recognition by immune cells
Antigen-presenting cells
Particles that are not part of the individual
Nonself
Adaptive immunity involving antibodies
Humoral immunity
Immunoglobulins that react with an antigen in a specific way; produced by activated plasma cells
Antibodies
Structure forming the base of the Y-shaped antibody; the most stable component
Constant region
Structure of antibody that allows binding to specific antigens
Variable regions
Differentiated B cells capable of responding much more rapidly when re-exposed to the same antigen; dramatically shortening and intensifying the immunologic response
Memory cells
Process by which memory cells respond much more rapidly when reexposed to the same antigen; dramatically shortens and intensifies the immunologic response
Immunologic memory
The selection and activation of specific B lymphocytes and T lymphocytes by the binding of epitopes to B or T cell receptors with a corresponding fit
Clonal selection
The proliferation of B and T lymphocytes activated by clonal selection to produce a clone of identical cells; enables the body to have sufficient numbers of antigen-specific lymphocytes to mount an effective immune response
Clonal expansion
Making ineffective any action, process, or potential
Neutralization
A process of rendering bacteria vulnerable to phagocytosis
Opsonization
A component of adaptive immunity; cytotoxic T cell-mediated destruction of pathogen and infected host cell
Cell-mediated immunity
Determine specific functions and responses of T-cell subtypes
Clusters of differentiation (CD)
Subtype of cytotoxic T lymphocyte that expresses the molecule CD8 on its cell surface
CD8 T lymphocytes
Subtype of helper T lymphocyte that expresses the molecule CD4 on its cell surface
CD4 T lymphocytes
1 class of CD4 helper T lymphocytes; activate macrophages, secrete chemokines and cytokines to attract macrophages; promote fusion of lysosomes with vesicles containing bacteria; and stimulate phagocytosis
Th1 cells
2 class of CD4 helper T lymphocytes; activate B cells to produce antibodies
TH2 cells
The major histocompatibility complex proteins in humans; HLA genes encode antigen specificity; important in transplant rejection
Human leukocyte antigens (HLAs)
Alteration of pathogen protein particles to evade recognition and stimulation of memory in the immune system
Antigenic variation
A period of dormancy
Latency
Condition resulting from an inadequate immune defense; may be primary (directly caused by an alteration in immunity) or secondary (a consequence of another disease process)
Immunodeficiency
Protein promoting altered reactivity responses by the immune system
Allergens
Describes individuals having a genetic predisposition to developing hypersensitivities
Atopic
Extreme manifestation to foreign protein or other substance
Anaphylaxis
Complex-mediated immune response in the skin resulting in an area of localized tissue necrosis
Arthus reaction
Reaction after allergen contact that is slow in onset and peaks after 36 to 48 hours; associated with a type IV cell-mediated hypersensitivity reaction
Delayed hypersensitivity reactions
Initial phase of delayed hypersensitivity reaction; stimulated by entry of antigen via the skin and presentation of antigen by Langerhans cells, stimulating immune responses
Sensitization phase
Second phase of delayed hypersensitivity reaction; memory cells in the dermis are stimulated after presentation with antigen by Langerhans cells, prompting activation of memory T cells and stimulation of cell-mediated responses
Elicitation phase
Immune responses directed at an individual's own tissues
Autoimmune
The process of converting lymphocytes from nonresponsive to self-reactive
Lymphocyte ignorance
Close resemblance between foreign antigen and self-antigen
Molecular mimicry
Propagation of a condition among family members
Familial tendency
Suppress autoreactive lymphocytes and regulate the immune response; also known as suppressor T cells
Regulatory T cells
Describes something that occurs in more than one form
Polymorphic
Containing several major histocompatibility complex (MHC) class I and II genes; interaction of several genes influenced by environmental factors
Polygenic
Grafts from different sites on the same person
Autograft
Graft from genetically identical individuals
Syngeneic
Graft between unrelated individuals
Allograft
Proteins that vary between individuals
Alloantigens
Antibodies produced against alloantigens
Alloantibodies
Rapid rejection of grafts
Hyperacute graft rejection
The most common form of tissue transplant; infusion of donor blood into recipient
Blood transfusion
The process by which the recipient's blood type is determined
Blood typing
A condition in which transplanted donor T lymphocytes mount an immune response against the host
Graft versus host disease (GVHD)
A major glucocorticoid secreted from the adrenal cortex that regulates metabolism, inflammatory/immune responses, and the stress response
Cortisol
Transfer of the genetic code from one type of ribonucleic acid to another; based on the nucleotide sequence of a complementary DNA template
Transcription
Blood levels of substances much higher than would normally be expected
Supraphysiologic
Weakened; reduced ability to cause disease
Attenuated
Antigens that promote activation of more than one cell type
Conjugated vaccines
Enveloped retrovirus that infects CD4 T cells, dendritic cells, and macrophages; virus associated with the secondary immunodeficiency, acquired immunodeficiency syndrome (AIDs)
Human Immunodeficiency Virus (HIV)
Development of antibodies to a particular antigen
Seroconversion
Swelling or enlargement of the lymph nodes
Lymphadenopathy
Contraction of the smooth muscle in the bronchi and bronchioles of the lungs, decreasing airway size
Bronchospasm
Sensation of itching
Urticaria
Sudden subcutaneous edema
Angioedema
Dormancy; temporary resting
Quiescence
Rash over cheeks; characteristic manifestation of systemic lupus erythematosus (SLE)
Malar
Red, raised, round rash
Discoid
Skin sensitivity to the sun resulting in rash
Photosensitivity
Circumscribed, open, craterlike lesion of the skin or mucous membranes
Ulcers
Inflammation of the lining of the lungs or pleural cavity
Pleuritis
Inflammation of the lining of the heart
Pericarditis
Protein in the urine
Proteinuria
Compacted collection of protein, cells, and debris that are formed in kidney tubules
Cellular casts
Abnormally low number of platelets
Thrombocytopenia
Destruction of blood cells
Hemolytic
Insertion of a needle into the uterine cavity to obtain a sample of amniotic fluid
Amniocentesis
Microorganisms that live on or within the body in nonsterile areas without causing harm
Resident flora
A disease-causing organism, such as a virus
Pathogen
Ability of a pathogen to produce an infectious disease; involving multiple factors, including the pathogen's potency, invasiveness, ability to evade the immune system, speed of replication, production of toxins, adherence to the human host cell, and the degree of tissue damage that is elicited
Pathogenicity
The potency of a pathogen indicated by the ratio of the number of cases of disease in a population compared with the number of people exposed to the microorganism
Virulence
The proportion of exposures needed to cause infection in an individual based on the pathogens' ability to enter, survive in, and multiply in the host
Infectivity
The ability of a pathogen to produce harmful toxins that increase host cell and tissue damage
Toxigenicity
The level to which a pathogen is viewed by the host immune system as foreign
Antigenicity
A process of eluding the human host defenses; often a result of altering the antigens present within or on the surface of the microorganism
Antigenic variability
The ways in which many pathogens have developed ways to avoid destruction by the host, such as through thick protective capsules, which prevent phagocytosis
Pathogenic defense mechanisms
A phenomenon of hosting two or more pathogens simultaneously
Coinfection
When a new infection arises in addition to one that is already present
Superinfection
Parasites that require the host for metabolism and reproduction
Obligate parasites
Microorganisms that may live on the host but can also survive independently
Facultative parasites
Single-celled microorganisms that can reproduce outside of host cells
Bacteria
Microorganisms that require oxygen for growth
Aerobic
Bacteria that do not require oxygen for growth
Anaerobic
The cytoplasm of bacteria that contains extensive ribosomes, proteins, and carbohydrates, but does not contain mitochondria, endoplasmic reticulum, or other membraneous components
Cytosol
A complex of phospholipid-polysaccharide molecules that form the structural component of the gram-negative cell wall and causes inflammatory mediators to be released, leading to a massive inflammatory response
Endotoxin
Pathogens that induce fever
Pyogenic
Potent substances produced by many bacteria, which result in host cell dysfunction or lysis
Exotoxins
Obligate intracellular parasites
Viruses
Particles released by cells infected by viruses, which can enter and infect other nearby cells
Virions
A period of dormancy
Latency
Unicellular forms of fungi that reproduce by budding
Yeasts
A multicellular form of fungus
Molds
Elongated chains formed by yeast through budding
Pseudohyphae
Tubular branches formed by mold colonies
Hyphae
A cluster of hyphae formed from mold colonies
Mycelium
Infections with fungi as the pathogen
Mycoses
Those that cause disease only in a host with a compromised immune system
Opportunistic pathogens
The softening and breaking down of tissue
Maceration
A vehicle that harbors a pathogen and carries it to a host
Vector
Diseases that are spread from person to person, often through contact with infected blood and body fluids
Communicable diseases
A device that uses steam heat at high pressures to sterilize objects
Autoclave
A standard of health care that recognizes all blood and body fluid as potentially infected
Universal precautions
The individual who is exposed to and contracts an infection
Host
A problem of microorganisms gaining access to the blood and circulating throughout the body
Septicemia
A state in which bacteria gain access to the blood
Bacteremia
A condition of altered perfusion by shock as the result of overwhelming systemic infection, often with gram-negative bacteria leading to inadequate perfusion of vital organs
Septic shock
Exudate that contains pus
Purulent
A process of changing genetic composition during replication in the human host cell leading to viral offspring with altered antigenic properties
Reassortment
A blood bypass through which deoxygenated blood from the gastrointestinal tract, spleen, and pancreas travel to the liver by way of the portal vein before moving on to the vena cava and heart
Portal circulation
Phagocytes housed in the liver
Kupffer cells
The yellow-tinged color of the skin and sclera of the eyes in those with liver disease
Jaundice
The formation of new red blood cells
Erythropoiesis
An end-stage liver disease marked by interference of blood flow to the liver and widespread hepatocyte damage
Cirrhosis
The upward movement of an infection
Ascending
Pain with urination
Dysuria
The need to urinate immediately
Urgency
Blood in the urine
Hematuria
Purulent exudate (pus) in the urine
Pyuria
Infection and subsequent inflammation of the kidneys
Pyelonephritis
A condition in which the eyes are extremely sensitive to light
Photophobia
A hyperextended stiff neck related to meningeal irritation
Nuchal rigidity
A test used to elicit meningeal pain; the patient is placed supine with knees bent and hips flexed, one knee is lifted upward, thereby eliciting pain
Kernig sign
A test of meningeal irritation where the patient is supine and the neck is quickly flexed; this activity elicits pain along with involuntary flexion of the hips and knees
Brudzinski sign
Passage of characteristics from parent to offspring
Heredity
Type of nucleic acid containing a sugar (deoxyribose); usually found in the cell nucleus and mitochondria; responsible for the storage of genetic information; made up of four nitrogenous bases, including adenine (A) and guanine (G), cytosine (C) and thymine (T)
Deoxyribonucleic acid (DNA)
Parent compound of the nitrogenous bases adenine (A) and guanine (G)
Purines
Parent compound of the nitrogenous bases cytosine (C) and thymine (T)
Pyrimidines
Nitrogen base combinations; DNA base pairs including cytosine and guanine, and adenine and thymine
Base pairs
Hereditary units containing information for the production of proteins
Genetic code
Sequence of three forms of nitrogen bases forms; nucleotide triplet; fundamental triplet code necessary for protein synthesis; basic compounds produced are amino acids
Codon
Nucleic acid that contains a sugar (ribose); responsible for the control of protein synthesis; made up of the four nitrogenous bases, including adenine (A) and guanine (G), cytosine (C) and uracil (U)
Ribonucleic acid (RNA)
Template for protein synthesis; depends on a codon sequence based on that of the complementary strand of DNA (cDNA); cytoplasmic area where protein is made in amino acid sequences
Messenger RNA
Different ways of assembling exons to produce a variety of mature mRNAs
Alternative splicing
Segment of DNA coded for protein production
Exons
Segment of DNA not involved in protein expression
Introns
Involved in the production of proteins with specific amino acid arrangements through interaction with mRNA
Transfer RNA
Form of RNA of ribosomes; associated with mRNA in the translation of the genetic code
Ribosomal RNA
Process involved in the production of protein from amino acids
Translation
Double-stranded DNA containing threadlike sections of genes that form an individual's genetic code; most commonly found in the cell nucleus; responsible for reproduction of physical and chemical structures; human somatic cells contain 46 chromosomes: 22 paired autosomes and 1 pair of sex chromosomes
Chromosomes
Process of reproduction of nuclear chromosomes in somatic cells; reproductive phases include prophase, prometaphase, metaphase, anaphase, and telophase; results in the creation of daughter cells with the same chromosome number and genetic makeup as the cell of origin
Mitosis
Process of sex cell (gamete) division; cell division resulting in gametocytes containing half (haploid) the number of chromosomes found in a somatic cell
Meiosis
Structure linking the chromosome pairs of the somatic cells of the body; divides the chromosome into two arms; constant position for each chromosome
Centromere
The number of chromosomes a human body cell contains; 23 pairs of chromosomes, or a total of 46
Diploid
Chromosomes other than a sex chromosome; totals 44 chromosomes in each body cell
Autosomes
Known as X and Y; the genetic determinants of the sex of an individual
Sex chromosomes
Ova and sperm; contains only one of the chromosome pairs, known as the haploid number
Gametes
Cells containing single chromosomes, rather than pairs; chromosome number totals 23 (22 autosomes, 1 sex chromosome); characteristic of gametes
Haploid
Transfer of the genetic code from one type of ribonucleic acid to another; based on the nucleotide sequence of a complementary DNA template
Transcription
Study of the human genome; includes the functions and interactions of all genes compromising an individual
Genomics
Genetic makeup of an individual
Genotype
Genetic traits that are apparent or observable
Phenotype
A series of two or more different genes occupying the same location on a specific chromosome
Alleles
Containing several major histocompatibility complex (MHC) class I and II genes; interaction of several genes influenced by environmental factors
Polygenic
Change in genes or sequence of base pairs that make up the chromosomes; genetic alteration perpetuated in subsequent cellular divisions
Mutations
A mutation occurring in body cells, rather than gametes; not transmittable to subsequent generations
Somatic mutation
Occurring in more than one form
Polymorphism
The evidence of the gene in the phenotype
Expressivity
Ability of a gene to express a mutation; influences the effects of mutations
Penetrance
Characteristics passed on by the transmission of a single gene
Single gene traits
Identical alleles on each chromosome
Homozygous
Different alleles on each chromosome
Heterozygous
Predictable trait transmission based on autosomal dominant or recessive genotypes
Mendelian pattern
An allele possessed by one of the parents of a hybrid that is expressed in the latter to the exclusion of a contrasting allele (the recessive) from the other parent
Dominant
Trait caused by a particular allele that does not manifest itself in the presence of other alleles that generate traits dominant to it
Recessive
Characteristics passed on by sex chromosomes; most often recessive traits; often linked to the X chromosome
Sex-linked
Heterozygous for a recessive genetic mutation; able to transmit the genetic mutation to subsequent generations in the absence of a disease phenotype
Carriers
Transmitted through female or maternal lines
Matrilineal
Random distribution of genes leading to a variable distribution in tissues
Heteroplasmy
Picture of arranged, paired, like chromosomes in order from largest to smallest
Karyotype
Failure of chromosome separation during meiosis or mitosis; results in an unequal number of chromosomes
Nondisjunction
Combination of cell lines with regular and altered numbers of chromosomes
Mosaicism
One copy of a chromosome, in place of the normal pair; the result of nondisjuncture
Monosomy
Presence of three copies of a chromosome in place of the normal pair; the result of nondisjuncture
Trisomy
Exchange of a section of chromosome from one to another; often occurs during meiosis; able to be transferred to subsequent generations
Translocation
Regulation of the expression of gene activity without alteration of genetic structure
Epigenetic
An epigenetic phenomenon; mechanism that controls of all genes compromising an individual
Genomic imprinting
Embryologic period of organ development
Organogenesis
Substances causing damage to a developing embryo or fetus
Teratogens
Condition resulting from exposure of a fetus to alcohol; characterized by mental handicap, growth deficit, and physical disability
Fetal alcohol syndrome (FAS)
Damage to a developing fetus
Congenital defects
Identification of genetic abnormalities before implantation of the blastocyst in the maternal uterine lining, the decidua
Preimplantation genetic diagnosis
Early embryo
Blastomere
Abnormal chromosome number
Aneuploidy
Difficulty in performing voluntary movements
Dyskinesia
Single gene disorder resulting from a mutation of the sickle beta globin gene; characterized by sickled hemoglobin (HbS); autosomal recessive
Sickle cell anemia
Adult form of hemoglobin
Hemoglobin A
Sickled form of hemoglobin
Hemoglobin S
Breakdown of red blood cells
Hemolysis
Yellow, lipid-soluble byproduct of hemoglobin; elevated levels result in jaundice
Bilirubin
Heterozygous for a mutation of the sickle beta globin gene; carrier of the autosomal recessive trait
Sickle cell trait
Enzyme important in catalyzing oxidation-reduction mitochondrial reactions in cellular respiration
Cytochrome oxidase
Cystic structure containing serous fluid
Hygroma
Fully differentiated body part with specialized functions
Organs
Groups of similar cell types that combine to form a specific function; the four major tissue types in the body include epithelium (skin), connective tissue (including blood, bone, and cartilage), muscle and nerve
Tissues
Smallest component of the living individual
Cells
An organized structure composed of lipids, carbohydrates, and proteins arranged in a bilayer; protects the cell by creating a barrier against the potentially hostile environment surrounding it
Plasma membrane
Two interconnected layers of the plasma membrane; the lipid (fat-soluble) layer contains phospholipid and glycolipid
Bilayer
An organized structure of two interconnected layers composed of nonpolar hydrophobic lipids tails connected to polar hydrophilic heads
Lipid bilayers
Phosphate bound to lipid heads of the plasma membrane
Phospholipids
Carrying a distribution of electrons that repels water; possessing affinity to water
Polar (hydrophilic)
Compound lacking positive or negative charge; lacking affinity to water
Nonpolar (hydrophobic)
Sugar bound to lipid heads of the plasma membrane
Glycolipids
Protein extending through the plasma membrane, contacting both the intracellular and extracellular components
Transmembrane proteins
Form of transmembrane protein; forms a channel in the plasma membrane for transport of ions
Integral proteins
Colloid substance surrounding the cell nucleus composed of water, proteins, fats, electrolytes, glycogen, and pigments
Cytoplasm
Structures within a cell that perform a distinct function
Organelles
Cellular organelle composed of a complex network of tubules; important in the production of proteins and fats and ion regulation; subtypes include rough and smooth
Endoplasmic reticulum
Cellular organelle with a membranous structure; prepares substances by the endoplasmic reticulum for secretion out of the cell
Golgi apparatus
Cellular organelle composed of small sacs surround by membrane; responsible for hydrolytic digestion of cellular debris
Lysosome
Cellular organelle made up of small membrane-enclosed sacs; promote cell survival by oxidation of oxygen free radicals
Peroxisomes
An oxygen atom carrying an unpaired electron and no charge
Oxygen free radicals
Large cellular organelle that recognizes abnormally folded or formed proteins; involved in proteolysis
Proteosomes
The process of cutting or splicing proteins into their smaller peptide units
Proteolysis
Cellular organelle containing enzymes involved in the citric acid cycle, fatty acid oxidation, and oxidative phosphorylation; principal producer of the cellular energy source adenosine triphosphate (ATP)
Mitochondria
Principal source of cellular energy; product of a chemical reaction between oxygen and nutrient products such as glucose, fatty acids, amino acids, and enzymes
Adenosine triphosphate (ATP)
Rounded mass of protoplasm within the cytoplasm of a cell; surrounded by a nuclear envelope enclosing structures responsible for mitosis during cell division
Nucleus
Tubule and filament structures, contributing to cell shape, movement, and intracellular transport; composed of microtubules and thin, intermediate, and thick microfilaments
Cytoskeleton
Movement of particles from an area of high to lower concentration
Diffusion
Membrane passage between the extracellular and intracellular environment
Membrane pore
Movement of water across a concentration gradient; water movement to an area of higher concentration of particles (less water content) from an area of lower concentration of particles (more water content); regulated by the concentration of particles that do not diffuse across the semipermeable membrane
Osmosis
Force generated as water moves through the membrane by osmosis
Osmotic pressure
Assisted movement of substances across the cell membrane; not energy dependent
Facilitated diffusion
Difference in electrical charge between the inside and outside of the cell
Membrane potential
Energy-dependent transport of particles across the cell membrane against a gradient
Active transport
Active transport process requiring the direct use of energy in the form of ATP
Primary active transport
Active transport mechanism involving movement of a second substance; dependent on energy derived from the active transport of the primary substance
Secondary active transport
Substances transported together in the same direction
Cotransport or symport
Substances transported in the opposite direction
Countertransport or antiport
Particle entry into the cytoplasm through incorporation into a vesicle via a portion of the cell membrane
Ingest
Transport mechanism involving vesicular enclosure of particles from the extracellular environment into the cytoplasm for use by the cell
Endocytosis
ATP -requiring process of ingesting very small vesicles
Pinocytosis
Ingesting large particles such as cells, bacteria, and damaged cellular components
Phagocytosis
The process of the release of metabolic products from cells
Secreted
The process of movement of granules or particles out of the cell; fusion of the membrane surrounding the granule with the cell membrane, followed by rupture and release of contents
Exocytosis
The process of oxygen use as a source of energy for production of ATP and release of metabolic products from cells
Respiration
Regulatory mechanism; response of input to a system by generation of output in a given system
Feedback mechanisms
A cytoplasmic or cell surface protein molecule structured to bind specific factors
Receptor
Molecules that bind to specific receptors; involved in signal transduction
Ligands
Mechanism of cellular communication; initiated by binding of ligand to receptor and resulting in an action through subsequent communication events
Signal transduction pathway
Tightness or strength of ligand/receptor interaction
Binding affinity
Substances involved in cellular responses in the immediate area
Local mediators
Chemical substances, formed in a tissue or organ and carried in the blood, that stimulated or inhibit the growth or function of other tissues or organs
Hormones
The rapid generation of new daughter cells divided from progenitor (parent) cells
Proliferation
A process of changing the physical and functional properties of a cell to allow greater specificity and functionality to that cell
Differentiation
Alteration in function that allows cells, tissues, and organs to adjust to new conditions; survival due to the capacity to adjust to an adverse environment
Adaptation
Cessation of life; cessation of the integration of cellular, tissue, and organ functions
Death
Decrease in the size of the cell
Atrophy
Local response to decrease in blood supply
Ischemia
Decrease in the size of tissues and organs
Involution
Condition that results from disuse because of impaired neural innervation to muscle tissue
Spinal muscular atrophy
Increase in cell size
Hypertrophy
Related to growth
Trophic
Enlargement of lymphoepithelial adenoid tissue in the back of the nasal area
Adenoid hypertrophy
Increase in the number of cells
Hyperplasia
Permanent cessation of menses for a 12 month period
Menopause
Changing of one cell type to another
Metaplasia
Actual change in cell size, shape, uniformity, arrangement, and structure
Dysplasia
Change in genes or sequence of base pairs that make up the chromosomes; genetic alteration perpetuated in subsequent cellular divisions
Mutations
Condition in which cellular alterations lead to chronic, irreversible tissue changes in the respiratory tree of the lungs
Bronchopulmonary dysplasia (BPD)
Potential source of cellular damage by exposure to reactive oxygen species
Oxidative stress
Programmed cell death that is prompted by a genetic signal and designed to replace old cells with new; also known as "cellular suicide"
Apoptosis
Fusion or incomplete separation of digit soft tissue
Syndactyly
Disorderly process of cell death associated with inflammation
Necrosis
Cellular damage from mechanical, thermal, or chemical sources
Physical injury
Damage caused by impact of a body part
Mechanical injury
Damage caused by extremes of temperature
Thermal injury
From within the body system
Endogenous
From the external environment
Exogenous
Damage caused by deprivation of oxygenation, hydration, and nutrition
Deficit injury
Toxic oxygen molecules or radicals that are formed by the reaction between oxygen and water during mitochondrial respiration
Reactive oxygen species (ROS)
Damage to cells resulting from reactive oxygen species
Free radical injury
Decrease in neuronal cell size and number leading to impaired neuronal communication and reduced brain tissue mass
Cerebral atrophy
A disease of cardiac muscle that results from excessive workload and functional demand
Cardiac hypertrophy
The expected distensibility, or expandability, of the lung tissue and chest wall
Compliance
Loss of consciousness; fainting
Syncope
Condition of hyperplasia prompted by hormone stimulation of excessive growth after closure of the epiphyseal growth plates of the long bones
Acromegaly
Long bone ossification site
Epiphyseal
Hormone secreted by the liver; promotes growth in bones, cartilage, soft tissues, and organs
Insulin-like growth factor 1
Benign tumor of glandular epithelial origin
Adenoma
Condition of hyperplasia characterized by excessive growth; growth hormone excess before the closure of the epiphyseal growth plates of the long bones
Gigantism
Epithelium consisting of a single flattened layer of cells
Squamous epithelium
Single layer of epithelial cells taller than they are wide
Columnar epithelium
Area between the external and internal cervical os; lined with columnar epithelium
Endocervical canal
Area of the merger of squamous and columnar epithelium; also known as the transformation zone of the cervix
Squamocolumnar junction
Area of the merger of the squamous and columnar epithelium; also known as the squamocolumnar junction of the cervix
Transformation zone
Outside of the cervix lined with squamous epithelium
Ectocervix
Nuclear genetic material made of DNA; condenses into chromosomes during mitosis
Chromatin
Invasive and destructive cellular growth, as in cancer
Malignancy
DNA virus; specific viral strains cause cutaneous and genital warts and severe cervical intraepithelial lesions
Human papilloma virus (HPV)
Cancer causing
Oncogenic
Active exposure to smoke
Mainstream smoke
Passive or secondhand smoke
Sidestream smoke
The rapid generation of new daughter cells divided from progenitor (parent) cells
Proliferation
A process of changing the physical and functional properties of a cell to allow greater specificity and functionality to that cell
Differentiation
Highly undifferentiated units that have the potential to divide into daughter stem cells, which can then mature into more differentiated units with a specific function
Stem cells
A term used to describe the origin, promotion, or development of cancerous neoplasms
Carcinogenesis
A term used to describe highly invasive and destructive neoplasms
Cancer
The process of starting with a single mutated cell and developing into cancer
Monoclonal origin
Genes that repair mutated DNA and protect the genome
Mutator genes
Genes that code for proteins involved in cell growth or regulation
Oncogenes
Genes that prohibit overproliferation of cells and regulate apoptosis
Tumor suppressor genes
"Normal" genes in the body with a vital role in regulating cell function; precursors to the development of oncogenes
Protooncogenes
A known cancer-causing agent
Carcinogen
A situation that causes a mutation in a cell
Initiating event
An expansion of a mutated cell's growth and reproduction; the continued growth of the cell depends on continued exposure to the promotor
Promoting event
An extension of the promotion phase with one exception: now the cancerous growth no longer depends on continued exposure to the promotor
Progression
The unregulated cell growth of neoplasms
Autonomy
A neoplasm's loss of differentiation
Anaplasia
Refers to hormone secretion from a site outside of an endocrine gland
Ectopic
Describes a tumor that remains localized and closely resembles the tissue of origin
Benign
Describes tumors that are invasive, destructive, spread to other sites, and do not resemble the tissue of origin
Malignant
The proliferation of the neoplasm within the tissue of origin
Local spread
A process of tumor cells moving into adjacent tissues and organs
Direct extension
A form of direct extension where neoplastic proliferation occurs within peritoneal and pleural cavities surrounding the affected tissue or organ
Seeding
Process that occurs when neoplasms are spread to distant sites often by way of the lymphatics or blood vessels
Metastases
A benign tumor of the squamous epithelium
Epithelioma
An epithelioma that presents as fingerlike projections
Papilloma
Benign tumor of glandular epithelial origin
Adenomas
Benign tumors that arise from germ cells
Teratomas
Tumor that arises from bone cells
Osteomas
Benign tumor that stems from chondrocytes
Chondromas
A malignant tumor of epithelial cells
Adenocarcinoma
A malignant tumor of chondrocytes
Chondrosarcoma
A unique term used to describe carcinomas that are confined to the epithelium and have not yet penetrated the basement membrane
Carcinoma in situ
A process of classifying the extent or spread of the disease from the site of origin
Staging
A process of differentiating the level of anaplasia depicted by the tumor
Grading
A syndrome of unexplained weight loss and tissue wasting related to the stimulation of inflammatory mediators, along with excess energy use, by the proliferating neoplastic cells
Cachexia
Substances that may be detected in cells or body fluids and can provide clues to the presence, extent, and treatment response of certain neoplasms
Tumor markers
Used to describe treating symptoms, such as pain, without curing the cancer
Palliative care
Mucosal epithelial depressions of the colon
Crypts
Hidden blood in the stool that is not visible
Occult
Visible blood in the stool
Frank
A procedure using an endoscope to perform direct visualization of the colon
Colonoscopy
Any immature cell
Blast cells
Episodes of nose bleeds
Epistaxis
Found in approximately 95% of those with chronic myelogenous leukemia (CML) and represents a chromosome 9 and 22 translocation, which activates oncogenes
Philadelphia chromosome
A malignant disorder of the lymphoid tissue often characterized by the painless, progressive enlargement of cervical (neck) lymph nodes
Hodgkin lymphoma
Originates in the cell components of lymph nodes following a B lymphocyte lineage; is the neoplastic cell that is diagnostic for Hodgkin lymphoma
Reed-Sternberg cell
A generic classification made up of a broad range of B-cell and T-cell malignancies within the immune system
Non-Hodgkin lymphoma