Epithelia & Secretions Flashcards
What germ layer develops epithelium?
ALL germ layers
Where do epithelia rest
basement membrane
TRUE or FALSE - epithelia have their own blood supply
FALSE
What is an example of epithelia transport
paracellular route in gut
What are the functions of the epithelia
barrier, absorption, secretion
What are the main types of epithelium
simple squamous, stratified, pseudo-straitified, transitional
Where is simple squamous epithelium
lungs, alveoli
Where is stratified epithelium
skin
Where is transitional epithelium
urothelium
Describe simple squamous epithelium
flattened and scale like
Where is simple cuboidal epithelium
kidney tubules, ducts of glands
Describe simple columnar epithelium
with or without cilia/microvilli
Where is simple columnar epithelium found
small intestine, gall bladder, bronchus
What are microvilli
finger like projections
Where are microvilli found
apical surface of absorptive cells
What is the function of microvilli
increase SA
What are cilia
motile structures
Where are cilia found
apical surface - respiratory and female reproductive tracts
Where is stratified epithelia found
vagina, tongue, mouth
What forms stratified epithelia
lower cubical cells
What is the function of stratified epithelia
protective against abrasion
What are the subtypes of stratified epithelia
squamous, kerantised
What is keratin
fibrous protein
Describe stratified squamous epithelium
non-keratinised
Where is stratified squamous epithelia found
vagina, mouth, oropharynx
Where is pseudo-stratified epithelia found
trachea, urinary bladder
What is the basement membrane composed of
several extracellular proteins
What proteins is the basement membrane composed of
collage IV and fibronectin
What is the function of the basement membrane
separate epithelium from connective tissue
What is an exocrine gland
secretion via a dut
What is an endocrine gland
secretion via NO ducts
What gland secretes proteins
serous glands
