___________________is the mechanical and chemical breakdown of foods into forms that cell membranes can absorb?

Digestion

Organs of the digestive system carry out these processes, as well as ingestion, propulsion, absorption and defecation

The digestive system consists of the ___________canal extending from the mouth to the ______, plus accessory ______ that empty into the alimentary canal

Alimentary

ANUS

ORGANS

Alimentary canal (gastrointestinal or GI tract)

FUNCTION: Digests and absorbs food

SYSTEM: Mouth, pharynx, esophagus,stomach, small intestine, and large intestine

Accessory digestive organs

Teeth, tongue, gallbladder

Digestive glands A) Salivary glands
B) Liver
C) Pancreas

ALIMENTARY CANAL

ACCESSORY ORGANS

Salivary glands
Secrete saliva: enzymes that initiate breakdown
of carbs. This begins the digestion of carbohydrates
There are three pairs of major salivary glands

Parotid glands
Submandibular glands
Sublingual glands

There are many minor glands scattered throughout the mucosa : t ongue, palate, and cheeks

ALIMENTARY CANAL:

STEP 1

Mouth: Mechanical breakdown of food MASTICATION begins chemical digestion of carbs

Pharynx
Connects mouth with esophagus

Esophagus pushes food to stomach
Peristalsis: Adjacent segments of
alimentary tract organs alternately contract
and relax, which moves food along the tract
distally
Segmentation: Nonadjacent segments
of alimentary tract organs alternately
contract and relax, moving the food
forward then backward. Food mixing and
slow food propulsion occurs.

ALIMENTARY CANAL

STEP 2

Liver: Produces bile (emulsifier of fats/lipids)

Gallbladder: Stores bile and introduces it into small intestine

Pancreas: Produces and secretes pancreatic juice,

Digestive enzymes

Bicarbonate ions ----->>>> into small intestine

ALIMENTARY CANAL

STEP 3

Stomach - Secretes acid and enzymes

mixes food with secretions to begin enzymatic
digestion of proteins

Small intestine: Mixes food with bile and pancreatic juice

FINAL enzymatic breakdown of food molecules

MAIN site of nutrient absorption

Large intestine
Absorbs water and electrolytes to form feces

Rectum : Regulates elimination of feces

Anus

Digestive Processes

WHAT ARE Six essential activities?

Ingestion - Swallowing can be divided into three stages:
Voluntary stage - where saliva is mixed with chewed food
Swallowing- begins and the swallowing reflex is triggered
Peristalsis - transports food in the esophagus to the stomach

Propulsion -
The palate and uvula raise
The hyoid bone and larynx elevate
The epiglottis closes off top of the trachea
The longitudinal muscles of pharynx contract
The inferior constrictor muscles relax and the esophagus opens; peristaltic waves pushes food through the pharynx

Mechanical digestion- CHEW CHURNING SEGMENTATION
Chemical digestion- PH ENZYMES
Absorption-SM. INTESTINE/ LYMPH/ BLOOD
Defecation- LRG. INTESTINE - MOSTLY H2O AND FECES TO ANUS

WHAT ARE THE General Characteristics of the Alimentary Canal?

The alimentary canal is a muscular tube about 8 meters long

Peritoneum and Peritoneal Cavity

Serous membrane of the abdominal cavity:
Visceral peritoneum on external surface of most digestive organs

Parietal peritoneum lines the body wall

PERITONEAL CAVITY : Between the two peritoneums (Fluid lubricates mobile organs)

________________ is a double layer of peritoneum
Routes for blood vessels, lymphatics, and nerves

Holds organs in place and stores fat

Mesentery

___________________ lie posterior to the peritoneum
___________________ are surrounded by the peritoneum.

Retroperitoneal organs

Intraperitoneal (peritoneal) organs

Branches of the sympathetic and parasympathetic divisions of the autonomic nervous system extensively innervate the alimentary canal, including:

____________ – controls secretions
____________ – controls gastrointestinal motility

Submucosal plexus

Myenteric plexus

_____________ – increase activities of digestive system
______________– inhibit certain digestive actions

Parasympathetic impulses(FEED/BREED)

Sympathetic impulses( FIGHT OR FLIGHT)

THE ______Ingests food: Mechanically breaks up solid particles using saliva

Prepares food for chemical digestion ( Mastication)

THE MOUTH

___________ is a thick, muscular organ that occupies the floor of the mouth and nearly fills the oral cavity when the mouth is closed

The tongue

_______________ forms the roof of the oral cavity and consists of a hard anterior part and a soft posterior part

The palate

Hardest structures in the body
There are ____ primary (deciduous)
There are _____secondary (permanent)

The teeth
(deciduous) teeth numbering 20
(permanent) teeth numbering 32

The different salivary glands have varying proportions of two types of secretory cells

___________produce a watery fluid with a digestive enzyme called salivary amylase
___________ secrete mucous

Serous cells

Mucous cells

__________
Secrete clear watery, serous fluid.
Rich in salivary amylase (CONVERTS STARCH AND GLYCOGEN= SIMPLE SUGARS )
______________
Secrete primarily serous fluid and some mucus.
______________
Secrete primarily mucus.

Parotid glands

Submandibular glands

Sublingual glands

_____________is a cavity posterior to the mouth from which the tubular esophagus leads to the stomach.
Both the _____________ and esophagus muscular walls function in swallowing.

The pharynx

The pharynx can be divided into 3 parts?

Nasopharynx
Oropharynx
Laryngopharynx

What is the Flat muscular tube from laryngopharynx to stomach, Pierces diaphragm at esophageal hiatus
and Joins stomach at the cardiac orifice ?

Esophagus

_________ is a J-shaped, pouch-like organ, about 25-30 centimeters long.It hangs inferior to the diaphragm in the upper-left portion of the abdominal cavity, has three layers of smooth muscle:

An inner circular layer
An outer longitudinal layer
A further inner layer of oblique fibers.

Stomach

The mucous membrane of the ______ has tubular gastric glands that secrete.

STOMACH

________ IS From the chief cells
Inactive form of pepsin

___________IS From pepsinogen in the presence of hydrochloric acid Is a protein splitting enzyme

Pepsinogen

Pepsin

______ IS From the parietal cells
Needed to convert pepsinogen to pepsin

Hydrochloric acid

_________From the goblet cells and the mucous glands Protective to stomach wall

______________From the parietal cells Is required for vitamin B12 absorption

Mucus

Intrinsic factor

______________ (air enters) → nasal cavity → ______________ (both air and food move through) → trachea → ______________ (large tubes leading to both lungs) → lungs.

nares

pharynx

bronchus

______________ pleura; covers the surface of the lung ______________ pleura; lines the thoracic wall

PARIETAL

VISCERAL

The space in between is called the ______________ cavity and it is filled with ______________ fluid.

PLEURAL

SEROUS FLUID

This fluid assists breathing movements by acting as a/an ______________.

lubricant-pleural fluid

Air flows from the trachea through the ______________, ______________, and ______________ bronchi to smaller and smaller bronchi. The trachea and bronchi contain ______________ to keep the airways open. Bronchi branch into ______________, which do not contain ______________ but do contain more ______________ muscle. This allows for regulation of air flow.

main bronchus

lobar

segmental

cartilage

terminal bronchiole

cartilage

smooth muscle

Airways from the nasal cavity through the terminal bronchioles are called the ______________ zone.

conducting zone

The function of this zone is to ______________ and ______________ the air.

warm, moisten

filter

Is there gas exchange in this zone? _______

no

The respiratory zone contains ______________ where gas is exchanged. This zone consists of the ______________ bronchioles, ______________ ducts, and ______________ sacs.

aveoli

respiratory

alveolar

alveolar

_________ From the goblet cells and the mucous glands: Protective to stomach wall

_______________ From the parietal cells. Is required for vitamin B12 absorption

Mucus

Intrinsic factor

1. Parasympathetic preganglionic nerve fiber (in vagus nerve)
2. Parasympathetic postganglionic impulses stimulate the release of gastric juice from gastric glands
3. Impulses stimulate the release of gastric
4. Gastrin stimulates gastric glands to release more gastric juice

Regulation of Gastric Secretions

O2 inhaled from environment and travels to alveoli of lungs. O2 is loaded by simple diffusion into the pulmonary capillaries and binds to hemoglobin forming oxyhemoglobin. CO2 is chemically released from the bicarbonate ion and unloaded by simple diffusion from the capillary to the alveoli to be exhaled.

O2 travels in blood to capillary bed and is released from hemoglobin unloaded by simple diffusion from the blood to the tissue. CO2 is loaded by simple diffusion into the blood from the tissue and carried in the blood as a bicarbonate ion back to the lungs.

The alveoli are the sites of the vital process of gas exchange between the air and the blood.

__________________ begin breaking down proteins, but the stomach is not well-adapted to absorb digestive products.

Gastric enzymes

Some water

Certain salts

Certain lipid-soluble drugs

Alcohol

The stomach does absorb

ALIMENTARY CANAL HAS WHAT TWO MAJOR FUNCTIONS?

1. DIGEST
2. ABSORB
3. JEJUNUM & ILEUM
4. MUSCLE TUBE @ 8 M LONG

MECHANICAL BREAKDOWN DUE TO CHEWING (MASTICATION) AND SALIVA

ENZYMES

DIGEST OF CARBS BC OF SALIVA

PAROTID - SEROUS FLUID (DIG. ENZYME AMYLAZE)

SUBMANDILAR - SEROUS / MUCUS

SUBLINGUAL - MUCUS

MOUTH

COMMON HALLWAY

PHYRYNX

MOVES FOOD THROUGH STOMACH

ESOPHAGUS

BILE- EMULSYFY FAT

WORKS WITH GALLBLADDER

STORAGE COMPARTMENT (FAT)

LARGEST INTERNAL ORGAN- CROWN UPPER RIGHT QUAD .

PRODUCES GYLCOGEN-->>GLUCOSE

CONVERTS NON CARBS

SYNTHESIZES

FORMS UREA

BREAKS DOWN RBC

REMOVES ALCOHOL

CONVERTS AMINO ACIDS

Phagocytosis of worn out RBCs and foreign substances

Removes toxins such as alcohol and certain drugs from the blood

LIVER( know 5 for test)

WASHER(CHURNING )

HC ACIDS

BREAKDOWN PROTIEN/ DIGESTION (FUNCTION)

J SHAPED POUCH

25-30 CM. @ UPPER LEFT QUADRANT

STOMACH

MIX AND BREAKDOWN

NUTRITION ABSORBTION

SML. INTESTINE

WHAT ARE THE LAYERS OF ALIMENTARY CANAL?

MUCOSA- CIRCULAR

SUBMUCOSA - MUCULARIS CONTROLS SECRETION

EXTERNA- LONG ( LAGITUTAL)

SEROUS- OUTER ; EPITILIAL AND MUCUS

WHAT ARE THE "INTRINSIC NERVE PLEXUSES ?

1. MYENTRIC
2. SUBMUCOSAL

FINGER LIKE PROJECTION

VILLI

DIGESTIVE SYSTEM: ACCESSORY ARE

TEETH

TONGUE

GALLBLADDER - CARODID

DIGESTIONAL GLANDS

SALIVARY GLANDS

LIVER

PANCREAS (ENDOCRINE) *APLHA*BETA * DELTA

FOOD

BOLLUS

__________ GOBLET ------>>> MUCOUS GLANDS (PROTECT STOMACH WALLS)

MUCUS

TOP OF STOMACH

FUNDUS

RIDGES

RUGAE

NERVE FIBER @ VAGUS NERVE

RELEASE OF GASTRIC JUICE -> GASTRIC GLAND

PARASYMPATIC

IMPULSE RELEASE OF GASTRIN

STIMULATES GASTRIC GLAND

SEE FOOD - STIMULATES TASTE/ CELL

CEPHALIC (VAGUS NERVE)

ACTIVATES STRETCH RECEPTORS

FOOD CHEMICALS --->>> G CELLS

(MEDULLA ---->>> VAGUS NERVE )

GASTRIC

LOW PH

PARTIALLY : FOOD & FAT

HYPERTONIC @ DUODENUM

GASTRIC RELEASE AT BLOOD

(STOP SIGNALS)

INTESTINAL

______________ DOESNT ABSORB OF DIGEST FOOD. ABSORBS SALTS, H2O, BOOZE, LIPID SOLUABLE DRUGS.

STOMACH

DIGESTED FOOD

CHYME

DUEL FUNCTION

ENDOCRINE/ EXOCRINE

RELEASES PANCREATIC JUICES

BY DUODEM- (PANCREATIC DUCT TO DUODEM)

FAT/PROTIEN / NUCLEIC ACID

AMYLASE - SPLITS GLYCOGEN

LIPASE- BREAK DOWN TRIGLYCENIDES

PANCREAS

EMOLSIFER / BREAKS DOWN FAT

BILE

SECRETION BY PANCREATIC JUICE

STIMULATES BILE SALTS

HEPO SPHINCTER TO RELAX

STIMULATES GALLBLADDER VIA VAGUS NERVE

CCK

WHICH NERVE STIMULATES GALLBLADDER MAKING BILESALTS AND PANCREATIC JUICE ?

VAGUS

CYSTIC AND HEPATIC DUCT FORM THE _________ DUCT

BILE

GREEN/YELLOW

H20 AND BILE SALTS ( DETERGANT)

EMULSIFICATION AND TO BREAK DOWN FATS(DIGESTIVE ENZYME)

SALTS- ABSORB FATTY ACID (CHOLESTROL)

RECYCLED AND RETURNED TO LIVER

Bile pigments

Cholesterol

Electrolytes

BILE (SALTS)

Bile secretion is stimulated by____________________

Bile salts in enterohepatic circulation, Secretin from intestinal cells exposed to HCl and fatty chyme

Gallbladder contraction is stimulated by________________________

Cholecystokinin (CCK) from intestinal cells exposed to proteins and fat in chyme

Vagal stimulation (minor stimulus)

CCK also causes the hepatopancreatic sphincter to relax

_________________is a tubular organ that extends from the pyloric sphincter to the beginning of the large intestine. It completes digestion of the nutrients in chyme, absorbs products of digestion, and transports the remaining residue to the large intestine. It consists of three parts that include. Duodenum. Jejunum. Ileum

The small intestine

In addition to mucous-secreting goblet cells, there are many specialized mucous-secreting glands (Brunner’s glands) that secrete a thick, alkaline mucus in response to certain stimuli Enzymes in the membranes of the microvilli include________ (7)?

• Peptidase – breaks down peptides into amino acids
• Sucrase, maltase, lactase – break down : disaccharides into monosaccharides
• Lipase – breaks down fats into fatty acids and glycerol
• Enterokinase – converts trypsinogen to trypsin
• Somatostatin – hormone that inhibits acid secretion by stomach
• Cholecystokinin – hormone that inhibits gastric glands, stimulates pancreas to release enzymes in pancreatic juice, and stimulates the gallbladder to release bile
• Secretin – stimulates the pancreas to release bicarbonate ions in pancreatic juice

Regulation of small intestine secretion occurs by_______(3)?

• Mucus secretion is stimulated by the presence of chyme in the small intestine
• Distension of the intestinal wall activates nerve plexuses in the wall of the small intestine
• Parasympathetic reflexes triggering the release of intestinal enzymes

What are the steps to Absorption of the Small Intestine ?

1. Villi: increase the surface area for absorption
2. Small intestine absorption is so effective that very little reaches the organ’s distal end, noting that:
3. Monosaccharides and amino acids absorb:
4. Through facilitated diffusion and active transport
5. Absorbed into blood
6. Large proteins are broken down and absorbed into villi
7. Fatty acids and glycerol absorb by:
8. Several steps involved as noted
9. Absorbed into lymph and blood
10. Electrolytes and water absorb:
11. Through diffusion, osmosis, and active transport
12. Absorbed into blood

LARGE INTESTINE : Cecum, colon, rectum, anal, canal. UNIQUE FEATURES AND LAYERS ?

Teniae coli- Three bands of longitudinal smooth muscle in the muscularis

Haustra - Pocketlike sacs caused by the tone of the teniae coli

Epiploic appendages - Fat-filled pouches of visceral peritoneum

Functions of the Large Intestine?

• Has little or no digestive function
• Absorbs water and electrolytes
• Secretes mucus
• Houses intestinal flora
• Forms feces
• Carries out defecation

Movements of the Large Intestine?

• Movements of the large intestine are similar to those of the small intestine
• It is slower and less frequent than that of the small intestine
• Movements include:
• Mixing movements
• Peristalsis
• Mass movements usually follow meals
• The defecation reflex relaxes the internal anal sphincter and then the external anal sphincter

MOVEMENT OF FECAL MATTER

1) Distension, or stretch, of the rectal walls due to movement of feces into the rectum stimulates stretch receptors there. The receptors transmit signals along afferent fibers to spinal cord neurons.

2) A spinal reflex is initiated in which parasympathetic motor (efferent) fibers stimulate contraction of the rectal walls and relaxation of the internal ; anal sphincter

3) If it is convenient to defecate, voluntary motor neurons are inhibited, allowing the external anal sphincter to relax so that feces may pass.

Feces is composed of materials not digested or absorbed, and include?

• Water
• Electrolytes
• Mucus
• Bacteria
• Bile pigments altered by bacteria provide the color

The pungent odor is produced by bacterial compounds including?

• Phenol
• Hydrogen sulfide
• Indole
• Skatole
• Ammonia

The respiratory system consists of passages that filter incoming air and transport it into the body, into the lungs, and to the many microscopic air sacs where gases are exchanged. Respiration is the process of exchanging gases between the atmosphere and body cells. Involves both the respiratory and the circulatory systems. Four processes that supply the body with O2 and dispose of CO2:_________(4) ?

• Ventilation (breathing)
• External respiration
• Transport of gases
• Internal respiration

RESPIRATION -> CIRCULATORY

RESPIRATION Pulmonary ventilation (breathing): movement of air into and out of the lung

External respiration: O2 and CO2 exchange between the lungs and the blood (BOTH)

CIRCULATORY: Transport: O2 and CO2 in the blood. Internal respiration: O2 and CO2 exchange between systemic blood vessels and tissues

WHY DO WE BREATHE?

1. Respiration occurs on a macroscopic level at the organ system
2. Gas exchange, oxygen and carbon dioxide, occur at the cellular and molecular levels
3. Aerobic reactions of cellular respiration allow for:

• ATP production
• Carbon dioxide generation forming carbonic acid

Organs of the Respiratory System?

Respiratory zone: site of gas exchange –respiratory bronchioles, alveolar ducts, and alveoli

Conducting zone: conduits to gas exchange sites

Includes all other respiratory structures : Respiratory muscles: diaphragm and other muscles that promote ventilation

Organs of the Respiratory System

The organs of the respiratory system can be divided into two tracts:

Upper respiratory tract: The nose, Nasal cavity, Sinuses, Pharynx

Lower respiratory tract: Larynx, Trachea,Bronchial tree, Lungs

________ is an enlargement in the airway superior to the trachea and inferior to the pharynx, It is composed of a framework of muscles and cartilages bound by elastic tissue

The larynx

______________ is a flexible cylindrical tube about 2.5 centimeters in diameter and 12.5 centimeters in lengthAs it extends downward anterior to the esophagus and into the thoracic cavity, it splits into the right and left primary bronchi

The trachea (windpipe)

___________________ consists of branched airways leading from the trachea to the microscopic air sacs in the lungs

The bronchial tree

The successive divisions of the branches from the trachea to the alveoli are?

1 .Right and left primary bronchi

2.Secondary or lobar bronchi

3.Tertiary or segmental bronchi

4.Intralobular bronchioles (12-14 generations)

5.Terminal bronchioles

6.Respiratory bronchioles

7.Alveolar ducts

8.Alveolar sacs

9.Alveoli

_________________is similar to that of the trachea, but the C-shaped cartilaginous rings are replaced with cartilaginous plates where the bronchus enters the lung. These respiratory tubes become thinner and thinner, and the cell layers thin and change until the alveoli is reached. It is the alveoli that provides surface area for gas exchange is similar to that of the trachea, but the C-shaped cartilaginous rings are replaced with cartilaginous plates where the bronchus enters the lung

These respiratory tubes become thinner and thinner, and the cell layers thin and change until the alveoli is reached

It is the alveoli that provides surface area for gas exchange

The structure of the bronchus

WHAT : Surrounded by fine elastic fibers, Contain open pores that AND Connect adjacent alveoli, Allow air pressure throughout the lung to be equalized - > House alveolar macrophages that keep alveolar surfaces sterile

Alveoli

____________ are soft, spongy, cone-shaped organs in the thoracic cavity

_________has three lobes and the left lung two lobes

LEFT AND RIGHT

RIGHT

WHAT ?? Occupy all of the thoracic cavity except the mediastinum, Root: site of vascular and bronchial attachments, AND Costal surface: anterior, lateral, and posterior surfaces?

LUNGS

WHAT AM I DESCRIBING ?

• Apex: superior tip
• Base: inferior surface that rests on the diaphragm
• Hilum: on mediastinal surface; site for attachment of blood vessels, bronchi, lymphatic vessels, and nerves
• Cardiac notch ( L) concavity that accommodates the heart

LUNGS

_______ is smaller, separated into two lobes by an oblique fissure

_______ has three lobes separated by oblique and horizontal fissures

Bronchopulmonary segments (10 right, 8–9 left)

_______are the smallest subdivisions; served by bronchioles and their branches

LEFT

RIGHT

LOBULES

(low pressure, high volume)Pulmonary arteries deliver systemic venous blood

• Branch profusely, along with bronchi
• Feed into the pulmonary capillary networks

Pulmonary veins carry oxygenated blood from respiratory zones to the heart

BLOOD SUPPLY / PULMONARY CIRCULATION

Systemic circulation (high pressure, low volume)

Bronchial arteries provide oxygenated blood to lung tissue

• Arise from aorta and enter the lungs at the hilum
• Supply all lung tissue except the alveoli

Bronchial veins anastomose with pulmonary veins

Pulmonary veins carry most venous blood back to the heart

BLOOD SUPPLY/ Systemic circulation (high pressure, low volume)

• Thin, double-layered serosa
• Parietal pleura on thoracic wall and superior face of diaphragm
• Visceral pleura on external lung surface
• Pleural fluid fills the slitlike pleural cavity

Provides lubrication and surface tension

Pleurae

____________________ is the movement of air from outside of the body into the bronchial tree and the alveoli. The actions responsible for these air movements are inspiration, or inhalation, and expiration, or exhalation

Breathing or ventilation

_______ IS Atmospheric pressure (Patm)

Pressure exerted by the air surrounding the body

760 mm Hg at sea level

Respiratory pressures are described relative to Patm

Negative respiratory pressure is less than Patm

Positive respiratory pressure is greater than Patm

Zero respiratory pressure = Patm

Pressure Relationships in the Thoracic Cavity

_________________ IS (Ppul). Pressure in the alveoli, Fluctuates with breathing

AND Always eventually equalizes with Patm.

Intrapulmonary (intra-alveolar) pressure

_______ IS Pressure in the pleural cavity, Fluctuates with breathingVAND Always a negative pressure (<Patm and <Ppul)

Intrapleural pressure (Pip)

Negative Pip is caused by opposing forces–Two inward forces promote lung collapse

• Elastic recoil of lungs decreases lung size
• Surface tension of alveolar fluid reduces alveolar size

One outward force tends to enlarge the lungs

• Elasticity of the chest wall pulls the thorax outward

Intrapleural Pressure

Atmospheric pressure due to the weight of the air is the force that moves air into the lungs. At sea level, atmospheric pressure is 760 millimeters of mercury (mm Hg)Moving the plunger of a syringe causes air to move in or out . Air movements in and out of the lungs occur in much the same way

Inspiration

• The relationship between the pressure and volume of a gas
• Pressure (P) varies inversely with volume (V):

P 1 V 1 = P 2 V 2

BOYLES LAW

The forces responsible for normal resting expiration come from elastic recoil of lung tissues and from surface tension. These factors increase the intra-alveolar pressure about 1 mm Hg above atmospheric pressure forcing air out of the lungs

EXPIRATION

CO2 + H2O =

CARBONIC ACID

MUSCLES TO BREATHE ?

SCALENES, SCM, INTERCOSTAL (IN/EX) , DIAPHRAGM

RIBS UP, DIAPHRAGM DOWN

Alveolar ventilation rate (AVR): flow of gases into and out of the alveoli during a particular time. Dead space is normally constant, Rapid, shallow breathing decreases AVR

Alveolar Ventilation

Used to assess a person’s respiratory status

Tidal volume (TV)

Inspiratory reserve volume (IRV)

Expiratory reserve volume (ERV)–Residual volume (RV)

Respiratory Volumes

• Inspiratory capacity (IC)
• Functional residual capacity (FRC)
• Vital capacity (VC)
• Total lung capacity (TLC)

Respiratory Capacities

Air movements other than breathing are called nonrespiratory movements. They clear air passages, as in coughing and sneezing, or express emotions, as in laughing and crying

Non-respiratory Air Movements

Respiratory Disorders That Decrease Ventilation: _____________

Bronchial Asthma and Emphysema

Groups of neurons in the brainstem comprise the respiratory areas that control breathing . Impulses travel on cranial nerves and spinal nerves, causing inspiration and expiration. Respiratory areas also adjust the rate and depth of breathing. The respiratory areas include:

• Respiratory center of the medulla
• Respiratory group of the pons

Respiratory Areas

A number of factors affect breathing rate and depth including:

• Partial pressure of oxygen (Po2)
• Partial pressure of carbon dioxide (Pco2)
• Degree of stretch of lung tissue
• Emotional state
• Level of physical activity

Receptors involved include mechanoreceptors and central and peripheral chemoreceptors

FACTORS OF BREATHING

Changes in blood pH, O2 and CO2 concentration stimulates chemoreceptors

Motor impulses can travel

from the respiratory center

to the diaphragm and external intercostal muscles

Contraction of these muscles causes the lungs to expand stimulating mechanoreceptors in the lungs

Inhibitory impulses from the mechanoreceptors back to the respiratory center prevent overinflation of the lungs

Factors Affecting Breathing

The alveoli are the sites of the vital process of gas exchange between the air and the blood.

“ Describe the exchange of O2 and CO2 in the lungs and body tissues. Include the names of the body structures needed, and how O2 & CO2 are transported in the blood.”

O2 inhaled from environment and travels to alveoli of lungs. O2 is loaded by simple diffusion into the pulmonary capillaries and binds to hemoglobin forming oxyhemoglobin. CO2 is chemically released from the bicarbonate ion and unloaded by simple diffusion from the capillary to the alveoli to be exhaled.

O2 travels in blood to capillary bed and is released from hemoglobin unloaded by simple diffusion from the blood to the tissue. CO2 is loaded by simple diffusion into the blood from the tissue and carried in the blood as a bicarbonate ion back to the lungs.

Alveolar Gas Exchanges

Part of the wall of an alveolus is made up of cells (type II cells) that secrete pulmonary surfactant . The bulk of the wall of an alveolus consists of a layer of simple squamous epithelium (type I cells) .Both of these layers make up the respiratory membrane through which gas exchange takes place

Respiratory Membrane

Molecules diffuse from regions where they are in higher concentration toward regions where they are in lower concentration. It is important to know the concentration gradient, In respiration, think in terms of gas partial pressures. Gases diffuse from areas of higher partial pressure to areas of lower partial pressure, The respiratory membrane is normally thin and gas exchange is rapid

Increased diffusion is favored with more surface area, shorter distance, greater solubility of gases and a steeper partial pressure gradient

Decreased diffusion occurs from decreased surface area

Diffusion Through the Respiratory Membrane

Air and food are routed into the proper channels by the ________.

larynx

The loudness of a personʹs voice depends on ________.

the force with which air rushes across the vocal folds

The walls of the alveoli are composed of two types of cells, type I and type II. The function of type II is ________.

to secrete surfactant

After the segmental (tertiary) bronchus, the next smaller branch of the respiratory passageway is (are) the ________.

terminal bronchioles

_________ O2 and CO2 between the lungs and the body cells. As the gases enter the blood, they dissolve in the plasma or chemically combine with other atoms or molecules

BLOOD TRANSPORTS

Gas Transport

Almost all oxygen carried in the blood is bound to the protein hemoglobin in the form of oxyhemoglobin. Chemical bonds between O2 and hemoglobin are relatively unstable. Oxyhemoglobin releases O2 into the body cells. About 75% of the O2 remains bound to hemoglobin in the venous blood ensuring safe CO2 levels and thereby pH

Oxygen Transport

Blood flowing through capillaries gains CO2 because the tissues have a high Pco2. The CO2 is transported to the lungs in one of three forms. WHAT ARE THEY ?

As CO2 dissolved in plasma

As part of a compound with hemoglobin

As part of a bicarbonate ion

WHERE ?

–HCO3– moves into the RBCs and binds with H+ to form H2CO3

–H2CO3 is split by carbonic anhydrase into CO2 and water

–CO2 diffuses into the alveoli

In pulmonary capillaries

Transport and Exchange of CO2

–Exemplified by chronic bronchitis and emphysema

–Irreversible decrease in the ability to force air out of the lungs

–Other common features

• History of smoking in 80% of patients
• Dyspnea: labored breathing (“air hunger”)
• Coughing and frequent pulmonary infections
• Most victims develop respiratory failure (hypoventilation) accompanied by respiratory acidosis

Chronic obstructive pulmonary disease (COPD)

–Characterized by coughing, dyspnea, wheezing, and chest tightness

–Active inflammation of the airways precedes bronchospasms

–Airway inflammation is an immune response caused by release of interleukins, production of IgE, and recruitment of inflammatory cells

–Airways thickened with inflammatory exudate magnify the effect of bronchospasms

Asthma

–Infectious disease caused by the bacterium Mycobacterium tuberculosis

–Symptoms include fever, night sweats, weight loss, a racking cough, and spitting up blood

–Treatment entails a 12-month course of antibiotics

Tuberculosis

–Leading cause of cancer deaths in North America

–90% of all cases are the result of smoking

–The three most common types

1.Squamous cell carcinoma (20–40% of cases) in bronchial epithelium

2.Adenocarcinoma (~40% of cases) originates in peripheral lung areas

3.Small cell carcinoma (~20% of cases) contains lymphocyte-like cells that originate in the primary bronchi and subsequently metastasize

Lung cancer

The smallest macroscopic subdivision of the lung is the ________.

lobule

The pleurae are vital to the integrity of the lungs because ________.

they produce a lubricating serous secretion, allowing the lungs to glide over the thorax wall during breathing

Intrapulmonary pressure is the ________.

pressure within the alveoli of the lungs

A fluid secreted into the small intestine during digestion that contains cholesterol, emulsification agents, and phospholipids is ________.

BILE

Select the statement that is true concerning primary teeth.

A) There are 27 primary teeth, and the molars are permanent.

B) There are 24 primary teeth, and no new primary teeth appear after 13 months.

C) There are 20 primary teeth, and by 24 months of age most children have all 20.

D) There are 32 primary teeth, and most children lose these teeth due to decay because they are never very strong.

20, 24 MONTH 20

Which of the following correctly describes mechanisms of CO2 transport?

1. A) 7- 10% of CO2 is dissolved directly into the plasma
2. B) 20% of CO2 is carried in the form of carbaminohemoglobin
3. C) as bicarbonate ion in plasma
4. D) attached to the heme part of hemoglobin

attached to the heme part of hemoglobin

How is the bulk of carbon dioxide carried in blood?

A) chemically combined with the amino acids of hemoglobin as carbaminohemoglobin in the red blood cells

B) as the bicarbonate ion in the plasma after first entering the red blood cells

C) as carbonic acid in the plasma

D) chemically combined with the heme portion of hemoglobin

as the bicarbonate ion in the plasma after first entering the red blood cells

The mechanical and chemical receptors that control digestive activity are located ________.

A) in the glandular tissue that lines the organ lumen

B) in the walls of the tract organs

C) in the pons and medulla

D) only in the esophagus because this is the only part of the tract that needs to change to accommodate food passage

in the walls of the tract organs

Complete the following statement using the choices below. Air moves out of the lungs when the pressure inside the lungs is

1. A) less than the pressure in the atmosphere.
2. B) greater than the pressure in the atmosphere.
3. C) equal to the pressure in the atmosphere.
4. D) greater than the intra-alveolar pressure.

greater than the pressure in the atmosphere.

When we ingest large molecules such as lipids, carbohydrates, and proteins, they must undergo catabolic reactions whereby enzymes split these molecules. This series of reactions is called:
a. absorption
b. secretion
c. chemical digestion
d. mechanical digestion 

chemical digestion

Which vitamin requires intrinsic factor in order to be absorbed?

1. A) B12
2. B) K
3. C) A
4. D) C

B12

The most powerful respiratory stimulus for breathing in a healthy person is ________.

A) loss of oxygen in tissues

B) increase of carbon dioxide

C) pH (acidosis)

D) pH (alkalosis)

increase of carbon dioxide

The statement, "in a mixture of gases, the total pressure is the sum of the individual partial pressures of gases in the mixture" paraphrases ________.

A) Henry's law

B) Boyle's law

C) Dalton's law

D) Charles' law

Dalton's law

The function of the hepatic portal circulation is to ________.

A) carry toxins to the venous system for disposal through the urinary tract

B) collect absorbed nutrients for metabolic processing or storage

C) distribute hormones

D) return glucose to the general circulation when blood sugar is low

collect absorbed nutrients for metabolic processing or storage

Peristaltic waves are ________.

A) segmental regions of the gastrointestinal tract

B) churning movements of the gastrointestinal tract

C) pendular movements of the gastrointestinal tract

D) waves of muscular contractions that propel contents from one point to another

waves of muscular contractions that propel contents from one point to another

Select the correct statement about oxygen transport in blood:

1. A) During normal activity, a molecule of hemoglobin returning to the lungs carries one molecule of O2.
2. B) During conditions of acidosis, hemoglobin is able to carry oxygen more efficiently.
3. C) Increased BPG levels in the red blood cells enhance oxygen-carrying capacity.
4. D) A 50% oxygen saturation level of blood returning to the lungs might indicate an activity level higher than normal.

A 50% oxygen saturation level of blood returning to the lungs might indicate an activity level higher than normal.

___ is the most common lethal genetic disease in the U.S

CYSTIC FIBROSIS

A baby is admitted to the hospital with a history of projectile vomiting after each feeding. On examination, it is found that the sphincter controlling food passage from the stomach to the duodenum is thickened and does not open readily. Because of the babyʹs loss of gastric juice, his blood probably indicates ________.

alkalosis

There are some 20 known pathogens found in the large intestine; our Ig ________ antibody-mediated response restricts them from going beyond the mucosa and causing problems.

IGA

Parietal cells of the stomach produce

HYDROCLORIC ACID

The terminal portion of the small intestine is known as the small intestine is known as the ______?

Ileum

Which respiratory-associated muscles would contract if you were to blow up a balloon?

A) diaphragm would contract, external intercostals would relax

B) internal intercostals and abdominal muscles would contract

C) external intercostals would contract and diaphragm would relax

D) diaphragm contracts, internal intercostals would relax

internal intercostals and abdominal muscles would contract

Catabolism involves processes that:
a. cause a decline in circulating ketone bodies
b. mobilize fat during the post absorptive state
c. break down complex structures to simpler ones
d. elevate glucagon levels

break down complex structures to simpler ones

Know parts of stomach

The solutes contained in saliva include ________.

electrolytes, digestive enzyme, mucin, lysozyme, wastes, and IgA

Which of the following is not found on the right lung?

CARDIAC NOTCH;
horizontal fissure;
middle lobe;
oblique fissure

Gastrin, histamine, endorphins, serotonin, cholecystokinin, and somatostatin are hormones or paracrines that are released directly into the lamina propria. Which of the following cell types synthesize and secrete these products?

parietal cells
enteroendocrine cells
mucous neck cells
zymogenic cells

enteroendocrine cells

Paneth cells ________.

are located next to the lacteal in a villus
secrete enzymes that kill bacteria
are more common in the ileum than in the jejunum
are absorptive cells in the small intestine

secrete enzymes that kill bacteria

Digestion of which of the following would be affected the most if the liver were severely damaged?

proteins
carbohydrates
starches
lipids

lipids

Gastrin is a digestive hormone that is responsible for the stimulation of acid secretions in the stomach. These secretions are stimulated by the presence of ________.

simple carbohydrates and alcohols
protein and peptide fragments
fatty acids
starches and complex carbohydrates

protein and peptide fragments

The capillaries that nourish the epithelium and absorb digested nutrients lie in the ________.
serosa
lamina propria
muscularis mucosae
adventitia

lamina propria

If an incision has to be made in the small intestine to remove an obstruction, the first layer of tissue to be cut is the ________.

mucosa
serosa
muscularis externa
submucosa

serosa

Which of the following is an essential role played by large intestine bacteria?

synthesize vitamin K and B-complex vitamins
synthesize vitamins C and D
produce gas
absorb bilirubin

synthesize vitamin K and B-complex vitamins

Which of these is not part of the ?

celiac artery
hepatic portal vein
superior mesenteric artery
inferior vena cava

inferior vena cava

Hormones or pancreas that inhibit gastric secretion include ________.

ACh
secretin
histamine
gastrin

secretin

The ducts that deliver bile and pancreatic juice from the liver and pancreas, respectively, unite to form the ________.

hepatopancreatic ampulla
bile canaliculus
portal vein
pancreatic acini

hepatopancreatic ampulla

Which hormone causes an increased output of enzyme-rich pancreatic juice and stimulates gallbladder contraction to release bile?

gastrin
cholecystokinin
secretin
gastric inhibitor peptide

cholecystokinin

Hepatocytes do not ________.

process nutrients
detoxify
store fat-soluble vitamins
produce digestive enzymes

produce digestive enzymes

You have just eaten french fries, buttered toast, ice cream, and whole milk. Which of the following glands would be active in helping you to digest this food?

THE PANCREAS

Know the layers of the alimentary canal, starting with the outermost layer

a. Serosa, Longitudinal Muscle, Circular Muscle, Submucosa, Mucosa

Where is salivary amylase released from?

a. Parotid gland

What does salivary amylase digest?

a. Carbohydrates
b. glucose

Gastrin: What is it for?

a. Hormone secreted by the stomach that regulates gastric juice secretion by stimulating HCl production.

Secretion of Cholecystokinin(CCK) from the intestinal wall is stimulated in the presence of what foods?

a. Fatty foods and protein

Secretin: inhibits

inhibits the action of pancreatic lipase.

Peristalsis vs. Segmentation

a. Peristalsis- occurs in stomach
b. Segmentation- occurs in small intestine

What is the function of the large intestine?

a. Absorption of water and electrolytes
b. Reservoir for fecal matter

What is the part of the digestive tract with the most lymph nodules and bacteria?

a. Ileum

What is the greater omentum formed out of?

a. Peritoneal membrane

If the liver is damaged , what is going to be harder to digest?

a. Lipids

Air moves out of the lungs when the pressure inside the lungs is ____?

a. Increased

Peristaltic waves; where are they starting?

a. Esophagus

The sheets of peritoneal membrane that hold the digestive tract in place….

a. Mesenteries

Expiration, unlike inspiration, is a passive act. Expiration depends on 2 factors…

a . Elastic recoil of the lungs
b. Surface tension of alveolar fluid

What structure has the greatest surface area for gas exchange in the lungs

a. Alveoli

What determines the direction of respiratory gas movement?

a. Partial pressure gradient

Cancers