Histology of Epithelia Flashcards Preview

Molecules to Man > Histology of Epithelia > Flashcards

Flashcards in Histology of Epithelia Deck (17):
1

What do you know about a single layer of epithelia

Squamous
Easy diffusion
Can be cuboidal - secretory
Can be columnar - absorption

2

What do you know about stratified layer of epithelia

Prevent water loss
Secretion
Protection

3

What do you know about pseudostratified layer of epithelia

Nuclei at different heights to give illusion of multiple layers
Ciliated
Upper respiratory tract

4

What determines classification of tissue

Top layer (apical)

5

Why does epithelia lie over connective tissue

Connective tissue supplies nutrients as it has the blood vessels

6

What is a tight junction

Lie beneath apical pole, run around cell
Forces nutrients to go through cell not in between
Stops ion channels from moving from top to bottom

7

What is function of adherins

Adhesion between cells

8

What is a desmosome

Disk shaped structure at surface of one cell that is matched with an identical structure on adjacent

9

What is a gap junction

A haxameric connexon

10

What is the function of hemidemosomes

Bind cells to basal lamina

11

What is the difference between microvilli, cilia and stereocilia

Microvilli = random and not motile. Actin filaments
Stereocilia = longer than microvilli+ less motile than cilia
Cilia = elongated + highly motile. Highly organised structure. 9 peripheral microtubules

12

What occurs to the urothelium when bladder is full or empty

Full bladder = distended
Empty spaces = non-distended.

13

What is eccrine secretion

Exocytosis of protein or glycoprotein

14

What is holocrine secretion

Cells fill up with secretory product, then burst

15

What is apocrine secretion

Secretory product secreted with apical cytoplasm

16

What is euchromatic

Less coiled portion of chromosome therefore pale staining
Read to transcribe

17

What is heterochromatic

Electron dense + coiled
Not ready to transcribe