epithelial tissue histo Flashcards
function of epithelial tissue in skin
protection
function of epithelial tissue in intestine
absorption
function of epithelial tissue in glandular epithelium
secretion
function of epithelial tissue in kidney
excretion
function of epithelial tissue in ovary
reproduction
function of neuroepitheloum
sensation
function of goblet cell
lubrication
function of myoepithelial cell
contraction
general characteristics of epithelial tissue
CELLULAR
AVASCULAR
FORMS MEMBRANES or GLANDS
ASSOCIATED WITH A BASEMENT MEMBRANE AND LAMINA/TUNICA PROPRIA
Surface specializations (4)
cilia, keratin, goblet cell, brush border
JUNCTIONAL COMPLEX
-prevents flow of matls bet epith cells
ZO
JUNCTIONAL COMPLEX
-actin filaments into electron-dense plaques; from terminal web
ZA
JUNCTIONAL COMPLEX
hairpin loops; cadherins
Desmosome/Macula adherens-
JUNCTIONAL COMPLEX
integrins, laminin, collagen type IV
Hemidesmosome-
function of Pseudostratified columnar epith w/ goblet cells & cilia (trachea, bronchi
cleanse the inspired air & transport mucus & particulate matter to the oral cavity for expulsion
function of Simple columnar epith w/ cilia (fallopian tubes, efferent ductules of the testes) -
conduct oocyte & sperm
function Pseudostratified columnar epith w/ stereocilia (epididymis, vas deferens) -
absorb fluid
part of simple squamous epithelium reduces friction by producing lubricating fluids;
transports fluids
mesothelium
part of simple squamous epithelium for passive transport of fluids, nutrients, & metabolites
ENDOTHELIUM-
SIMPLE CUBOIDAL EPITHELIUM w/ BRUSH BORDERS or MICROVILLI functions (2)
Absorption of nutrient materials & fluids from the filtrate that passes through the tubules
Responsive to the ADH & control resorption of water from the glomerular filtrate, thus, affect urine density, & help retain water content of the body
FUNCTIONAL CORRELATIONS of transitional epithelium
Allows distensibility of urinary organs (calyces, pelvis, ureters, & urinary bladder) without breaking the cell contacts
Forms a protective osmotic barrier between urine in the u.bladder & underlying tissue fluids
functional correlations of STRATIFIED SQUAMOUS EPITHELIUM
For protection of surfaces due to its multi-layered cellular composition Keratin layer (skin) - additional protection from abrasion, dessication, & bacterial invasion
TYPES of MEMBRANES
CUTANEOUS – skin
SEROUS – pleura, pericardium, peritoneum
MUCUS – GIT, respiratory tract
SYNOVIAL – bursae of tendon sheaths
