Cell Epithelia

Question 1

Definition of Epithelia?

Answer 1

Cohesive sheet of cells with 1/more layers resting on a basement membrane

Question 2

3 functions of epithelia?

Answer 2

1) Protection
2) Secretion (Pancreas)
3) Absorption (gut)

Question 3

Define Simple Epithelia:

Answer 3

Single layer of cells on a basement membrane

Question 4

Definite Stratified Epithelia

Answer 4

Two or more layers on a basement membrane

Question 5

3 types of Simple Epithelia?

Answer 5

1) Simple Squamous: Flattened plate like on BM (Around blood vessels, outside lungs and abd organs)
2) Simple Cub: Similar H&W, kidney tubules and small ducts
3) Simple Col: Taller than wide, stomach int and uterus

Question 6

Location and Function of Microvilli?

Answer 6

LS of absorptive cells, increase surface area as part of brush border

Question 7

Location and Function of Cilia:

Answer 7

Respiratory Tract & Fallopian Tubes, Waft mucus to larynx (Beat rhythmically)

Question 8

Define Pseudostratified Epithelia?

Answer 8

Single layer (looks like multiple), lines conducting airways

Question 9

Define urothelium?

Answer 9

Lines bladder, renal pelvis and ureters (Pale pink), appears thicker than it is

Question 10

Detection of Basement Membrane?

Answer 10

Always present, can detect by 2 different colours on stain (H&E doesn’t stain it)

Question 11

What is the BM composed of?

Answer 11

Collagen IV and Fibronectin

Question 12

Function of Occluding Junction? (Tight) (Epidermal of gut)

Answer 12

Prevents diffusion between cells (impervious to most molecules)

Question 13

Function of Gap Junction? (Intestinal)

Answer 13

Electrical junction allowing transfer of small molecules (from 1 to another)

Question 14

Function of Desmosomes?

Answer 14

Form physical joins between cells, and connect cytoskeletons

Question 15

What colour does H&E stain mucuous?

Answer 15

Doesn’t stain it, appears white