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Anatomy and Physiology > Epithelium > Flashcards

Flashcards in Epithelium Deck (44)
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31

Pseudostratified

Looks stratified but really not; one layer of cells but different heights
pseudo= false

32

Simple Squamous

-Little protection; good for filtration (allows things to diffuse through them; form/function)
-Lines blood vessels/capillaries
-serosal membrane (ex: mesothelium- inside lining of lung)

33

How does oxygen get to simple squamous epithelia?

O2 gets absorbed by alveoli in lungs, diffused into capillaries, and since simple squamous is only one cell thick, it absorbs it quickly

34

What are the most common gasses in air?

N2, O2 (20%), CO2 (1%)

35

Simple cuboidal

One layer thick of cubes; absorption in kidney (many microvilli)

36

Simple columnar

-Sometimes have cilia, sometimes not; goblet cells for mucous production (mucous=sugar)
-digestive tract, urine tubes, pancreatic duct, oviduct

37

What kinda of epithelium is in the trachea?

Psuedostratified ciliated columnar epithelia

38

Stratified squamous epithelium

-MOST COMMON type of stratified epithelium
-protection vs. abrasion
-high mitotic index
-cells shed from apical region
- different layers may have different shapes but name is based off of the free apical (top) surface
-Basal layers: usually not squamous, site of new cell generation

39

Example of stratified squamous

SKIN

40

Keratin

On apical surface of stratified squamous; water insoluble protein (extra layer on top of skin; NOT in places with moisture like nose, mouth, vagina, etc.)

41

Why do we need moisture in our noses?

Function is to warm air; warmer it is the faster it diffuses so we humidify it with moisture

42

Stratified columnar

-Very RARE
-Urethra of male
-some large organ ducts of glands

43

Stratified cuboidal

-RARE
-2 to 3 cells deep
-Largest ducts of: sweat glands, mammary glands, salivary glands, surrounding eggs

44

Transitional Epithelium

(Stratified)
-Urinary bladder *
-Cuboidal on top, columnar on bottom
-Stretches out when bladder is full