Flashcards in Epithelium Deck (44)
Looks stratified but really not; one layer of cells but different heights
-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)
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
What are the most common gasses in air?
N2, O2 (20%), CO2 (1%)
One layer thick of cubes; absorption in kidney (many microvilli)
-Sometimes have cilia, sometimes not; goblet cells for mucous production (mucous=sugar)
-digestive tract, urine tubes, pancreatic duct, oviduct
What kinda of epithelium is in the trachea?
Psuedostratified ciliated columnar epithelia
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
Example of stratified squamous
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.)
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
-Urethra of male
-some large organ ducts of glands
-2 to 3 cells deep
-Largest ducts of: sweat glands, mammary glands, salivary glands, surrounding eggs