cell junctions and epithelium

Question 1

five types of cell junctions

Answer 1

tight
adherens
desmosomes
hemidesmosomes
gap

Question 2

tight cell junctions+Eg

Answer 2

prevent leakages Eg urinary bladder

Question 3

adherens+Eg

Answer 3

joins multiple cells together for one function Eg cardiac muscle

Question 4

desmosomes+Eg

Answer 4

links intracellular to intermediate filament Eg epidermis

Question 5

hemidesmosomes+Eg

Answer 5

anchor epithelial cells to the basement membrane Eg skin

Question 6

Gap+Eg

Answer 6

joins two cells and allows the flow of ions and molecules Eg neurons

Question 7

types of epithelial tissue

Answer 7

covering and glandular

Question 8

what is epithelial tissue

Answer 8

uninterrupted layer of tightly packed cells which is avascular

Question 9

what is the basement membrane

Answer 9

two layers which join to the epithelium and lamina propria

Question 10

types of epithelia

Answer 10

simple, stratified =squamous, cuboidal columnar
transitional, pseudostratified columnar

Question 11

what is simple squamous cells, function, Eg location

Answer 11

flat irregular shapes tightly packed in a mosaic pattern
function, diffusion and filtration
location-pulmonary alveoli , kidney

Question 12

what is simple cuboidal epithelium, function, Eg location

Answer 12

tightly packed cubed shaped cells with central nuclei
function-secretion, filtration and absorption
location glands and glandular organs

Question 13

what is simple columnar epithelium, function, Eg location

Answer 13

column shaped cells tightly packed with the nucleus positioned towards the basement membrane
function-protection, lubrication, secretion and absorption
location-lining of the intestines, uterine tubes and bronchioles

Question 14

pseudostratified epithelium

Answer 14

cells are different heights with variable nucleus locations, can be ciliated or non ciliated

Question 15

function of ciliated pseudostratified epithelium cell, and Eg of location

Answer 15

protection, secretion of mucin, movement of particles and mucus
location-bronchi, trachea, nasal cavities

Question 16

function of a non-ciliated pseudostratified epithelium cell

Answer 16

protection
location-male urethra, epididymis

Question 17

what is stratified squamous cell, function, location

Answer 17

flattered cells on the surface of then random shaped bellow, can be either keritinised or non keritinised
function-top layer wears away and tears
location-keritinised(dry)=skin, epidermis
non kertinised(wet)=mouth, esophagus,larynx,vagina,anal cavity

Question 18

what is transitional epithelium, function, location

Answer 18

cell shape is based off of the level of distension, flat when stretched and cuboidal when relaxed
function protection and distensibility
location-lining of the urinary bladder, ureters, renal calyces

Question 19

what is stratified cuboidal epithelium, function, location

Answer 19

two or three layers of cuboidal cells
function-protection, secretion
location-duction of sweat glands, pancreas

Question 20

what is a glandular epithelia

Answer 20

cells specialised for the secretion of proteins, lipids, salts, carbohydrates