epithelial tissue Flashcards
shapes of epithelial cells
squamous, cuboidal, columnar
functions of epithelial cells
physical protection
control permeability
provide sensation
produce specialised sercretions
name 3 intercellular junctions
gap
tight
desmosomes
what attaches the deepest epithelial cells to the basal lamina?
Hemidesmosomes
describe the structure of simple squamous
one layer
scrambles eggs
delicate
where is simple squamous usually found and why?
in protected regions in the body, where absorption or diffusion takes place, needs slick/slippery surfaces to reduce friction.
kidneys, inside the eye, at the gas exchange surfaces of the lung
what type of epithelium lines each venteral body cavity?
mesothelium (simple squamous)
what type of epithelium lines the heart and blood vessels?
endothelium
where is stratified squamous found and why?
in places of severe mechanical or chemical stresses(multi layers)
mouth, throat, esophagus, rectum, anus and vagina
what is keratin, where is it found and what does it do?
chemical that is found in stratified squamous cornified(or keratinised) epithelium it makes our skin water proof, and tough does not need to stay hydrated
dead skin cells
what type of epithelial tissue is found in the bladder?
transition
what is the respiratory epithelial?
pseudostratified
describe the structure of pseudostratified epithelium
simple columnar ciliated
Exocrine glands
Secrete onto external surfaces or into internal pathways(ducts) that then connect to exterior
Endocrine glands
Secret hormones or precursors into the interstitial fluid, then usually distributed by blood steam
