Epithelia Flashcards
example of simple cuboidal and functions
in colloid thyroid gland follicles synths thryoxine and stores n colloid to be released into blood. collecting duct of kidney sweat gland surface of ovary
absorption and conduit
absorption and secretion
barrier/covering (ovary)
hormone synthesis, storage and mobilisation (thyroid)
examples of simple columnar and function
digestive tract - stomach lining, gastric glands, small intestine, colon, crypts of Leiberkuhn gall bladder striated duct of parotid fallopian tube bronchiole - simple columnar ciliated
absorption
secretion
lubrication
transport
Give examples of where simple squamous can be found and function
endothelium of blood and lymph and heart chambers
lines pleural sac, pericardial sac and peritoneum - mesothelium
bowmans capsule, loop of henle, middle and inner ear.
lubrication
gas exchange
barrier
active transport by pinocytosis
define epithelial tissue
sheets of contiguous cells of varied embryonic origin that cover external surfaces of the body and line internal surfaces
examples of pseudostratified and function
upper respiratory tract - nasal cavity, trachea, and bronchi
epididymis and ductus deferens
secretion and conduit
absorption
mucus secretion
particle trapping and removal
example of stratified squamous
vagina - lubrication and protection against abrasion
oesophagus - protects from abrasion
reduces water loss but remains moist
example of transitional (may be columnar or cuboidal)
renal calyces ureters bladder urethra cuboidal - sweat glands columnar - conjunctive of eye and excretary ducts
example of stratified columnar
penile urethra
Give four functions of epithelia
absorption
secretion
sensory
contractile
give a function of simple squamous
selective diffusion
small barrier
give a function of columnar epithelia
absorption / secretion
with lots of ER, golgi
may have microvilli to increase surface area for absorption
portective
location and function of stratfied squamous keratinized
surface of skin
limited distribution in oral cavity
protection against abrasion and trauma
prevents water loss
prevents ingress of microbes
shields against uv light damage
what are microvilli and what is there function?
apical extensions
increase surface area for selective absorption of intestinal contents
what are stereocilia and what do they do?
elongated of microvilli
may have absorptive function
what are cilia and what do they do?
specialised projections of plasma membrane
with 9+2 arrangement
can propel material across the cell surface
