Tissues : the living fabric

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1

Tissues

Group of cells with similar structures or related function

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4 Basic types of tissues

Epithelial
Connective
Muscle
Nervous

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Epithelial

Covering

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Connective

Support

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Muscle

Movement

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Nervous

Communication

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Histology

Study of tissues

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Primary Germs Layers

Formation of the 1st embryonic events

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3 Different layers that give rise to the four primary tissues

Ectoderm
Mesoderm
Endoderm

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Ectoderm

Superficial- nervous tissues and skin

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Mesoderm

Middle- muscle, connective tissues

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Ectoderm

Deep- lining of digestive system, respiratory tract

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Epithelial Characteristics

Tightly packed cells forming sheets
Little to no intracellular space
High regeneration
Supported by a CT basement membrane
Avascular- No blood vessels

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Epithelial Locations

Skin, membranes, lining of cavities
Forming glands of the boby

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Epithelia Classification

Has two part names

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1st part tells

numbers of layers

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Simple

one layer

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Stratified

many layers

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2nd part tells

shape of the cell

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Squamous

Flattened, scale like

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Cuboidal

boxlike

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Columnar

taller, and wide

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Others

transitional, glandular, pseudostratified

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Simple Squamous Epithelia
Single layer;flattened
Nuclei location: central

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Simple Squamous Epithelia
Function

Allowing for fast filtration or diffusion of substances

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Simple Squamous Epithelia
Locations

Air sacs of lungs, lining of blood vessels and heart chambers, serous membranes

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Simple Cuboidal Epithelia
Single layer of cube
Nuclei Location: central

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Simple Cuboidal Epithelia
Functions

Absorption and Secretion

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Simple Cuboidal Epithelia
Locations

Duct walls of gland, Kidney tubules, surface of ovary

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Simple Columnar Epithelium
Single layer Tall
Nuclei Location: Bottom of cell

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Simple Columnar Epithelium
Functions

Absorption and secretion

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Simple Columnar Epithelium
Locations

Digestive tract, Gland ducts
Gallbladder

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Ciliated Simple Columnar Epithelium

Ciliated Simple Columnar epithelium
Single layer of tall
Contains: Cilia
May Contain goblet cells produce mucus

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Ciliated Simple Columnar Epithelium

Secretion and Movement

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Ciliated Simple Columnar Epithelium

Small bronchi, uterine/fallopian tubes, auditory tubes

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Several layers of flat cells
May contain a tough protective protein: Keratin

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Protection and Durability

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Wear and tear areas
1. epidermis carries keratin
2. Mouth, tongue, esophagus
3. Vagina

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Pseudostratified Columnar Epithelium
One layer of column but appears as several layers
Surface my contain: cilia
May contain: Goblet cell

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Pseudostratified Columnar Epithelium
Functions

Absorption and Secretion
Movement of mucous

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Pseudostratified Columnar Epithelium
Location of ciliated

Upper respirator tract

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Location of nonciliated

Ducts that carry sperm

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Transitional Epithelium

Appearance varies

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Transitional Epithelium
Function

Allows for stretch and distension

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Transitional Epithelium
Location

Bladder and Ureters-connects kidneys to bladder