lecture 2

Question 1

what is epithilia

Answer 1

sheets of contiguous cells, varied in embryonic origin that cover the external surface of the body and line internal surfaces

Question 2

position of basement membrane

Answer 2

thin, flexible, acellular layer between epithelial cells and connective tissue

Question 3

function of basement membrane

Answer 3

strong layer where epithilial cells adhere. cellular and molecular filter

Question 4

structure of basement membrane

Answer 4

made of basal lamina, closest to epithilial cells. may also have reticular fibrils from connective tissue which makes it thicker

Question 5

what does simple mean

Answer 5

one cell layer thick

Question 6

how does simple squamous cells look

Answer 6

very flat with bulging nucleus

Question 7

what does simple squamous line

Answer 7

blood vessels: endothelium
body cavities; pericardium, pleural sac, peritoneum: mesothelium
alveoli
bowmans capsule
loop of henle
inner and middle ear

VACKE

Question 8

functions of simple squamous

Answer 8

lubrication in body cavities
gas exchange in alveoli
barrier in bowmens
active transport in meso and endothelium
BAGL

Question 9

where is simple cuboidal

Answer 9

thyroid follicles, ducts of exocrine glands, kidney tubules, ovary
KOTE

Question 10

functions of simple cuboidal

Answer 10

exocrine gland absorption and conduit
kidney tubules: absorption and secretion
Ovary: barrier
Thyroid: hormone synthesis, storage and metab
HAB

Question 11

where is simple columnar epithilia

Answer 11

stomach, small intestine, gall bladder, uterus, oviduct, testis, larger ducts
stomach and repro

Question 12

functions of simple columnar

Answer 12

absorption: small intestine and colon and gall bladder
secretion: stomach, small intestine, colon
lubrication; small intestine and colon
transport; oviduct
LAST

Question 13

function of microvilli

Answer 13

microvili is for absorption
in simple columnar, microvili occludin binds adjacent p membranes together in the apical (lumen) epithilia. membrane proteins cant pass through zona occludens. cell can restrict proteins to apical or basal side.

Question 14

pseudo stratified epithilia location

Answer 14

nasal cavity, trachea, bronchi (upper respiratory)

epididymis

Question 15

pseudo stratified epithilia function

Answer 15

secretion
absorption- epididymis
mucus secretion- urt

Question 16

Stratified Squamous Non-Keratinised Epithelia location

Answer 16

Locations include:

• Oral cavity
• Oesophagus
• Larynx
• Vagina
• Part of anal canal
• Surface of cornea
• Inner surface of eyelid

Question 17

Stratified Squamous Non-Keratinised Epithelia function

Answer 17

Functions include:

• Protection against abrasion (all sites)
• Reduces water loss whilst remaining moist

Question 18

Stratified Squamous Keratinised Epithelia

Locations

Answer 18

• Surface of skin

- Limited distribution in oral cavity

Question 19

Stratified Squamous Keratinised Epithelia functions

Answer 19

Functions include:

• Protection against abrasion and physical trauma
• Prevents water loss
• Prevents ingress of microbes
• Shields against UV light damage

Question 20

Stratified Transitional (urinary) Epithelia
Locations

Answer 20

include:

• Renal calyces (singular = calyx)
• Ureters
• Bladder
• Urethra

Question 21

Stratified Transitional (urinary) Epithelia function

Answer 21

Functions include:

• Distensibility
• Protection of underlying tissue from toxic chemicals

Question 22

renewal rate depends on

Answer 22

function, location, and constant rate for each epithilium (unless injury which accelerates)

Question 23

renewal rate for epidermis

Answer 23

28 days

Question 24

small intestine renewal rate

Answer 24

4-6 days

Question 25

what happens is cells arent renewed

Answer 25

proliferation triggers replacement cells