Epithelial Cells (Locations, Purposes, Parts, Junctions)

Question 1

Where is epithelial tissue found

Answer 1

Body surface and lining of hollow organs, cavities and ducts, as well as forming certain glands

Question 2

What are the purposes of epithelial tissue

Answer 2

Limiting or aiding transfer, secretion onto a free surface, protection from abrasion

Question 3

What are the two different cytoskeleton components

Answer 3

Actin Microfilaments and Keratin Intermediate Filaments

Question 4

Microfilaments are predominantly composed of…

Answer 4

Actin

Question 5

Intermediate filaments are predominantly composed of…

Answer 5

Keratin

Question 6

What do microfilaments do?

Answer 6

Provide shape and strength to the cell and initiate cell movement

Question 7

What do intermediate filaments do?

Answer 7

Provide shape and strength to the cell and move material around the cytoplasm

Question 8

How do tight cell junctions hold cells together?

Answer 8

They “stitch” them together near the apical end of the cell with claudin and occludin

Question 9

Will a tight cell junction allow for ions to pass between cells?

Answer 9

No, they are electrically tight

Question 10

What are tight cell junctions made out of?

Answer 10

Claudin and Occludin

Question 11

The gap within an adherence cell junction is spanned by what protein?

Answer 11

Cadherin

Question 12

____ helps ____ bind to ____ ____in an adherence cell junction

Answer 12

Catenin helps bind Cadherin to Actin Microfilament in an adherence cell junction

Question 13

A gap cell junction is formed by a combination of six ____ to form one ____ between cells

Answer 13

A gap cell junction is formed by a combination of six connexins to form one connexon/hemichannel between cells

Question 14

Gap junctions form ___ between cells which allow transfer between cells

Answer 14

Gap junctions form tunnels between cells which allow transfer between cells

Question 15

Desmosomes cell junctions look like what?

Answer 15

Buttons

Question 16

The gap within a desmosome cell junction is spanned by what protein?

Answer 16

Cadherin

Question 17

___ links to ___ ___ ___ in a desmosome cell junction

Answer 17

Cadherin links to keratin intermediate filaments in a desmosome cell junction

Question 18

Hemidesmosome cell junctions bind to what membrane?

Answer 18

The basement membrane

Question 19

Hemidesmosome cell junctions look like what?

Answer 19

Buttons

Question 20

Hemidesmosome cell junctions bind to what cytoskeleton component?

Answer 20

Keratin intermediate filaments

Question 21

The gap between the basement membrane and a hemidesmosome button are bridged by what?

Answer 21

Integrin

Question 22

What does a hemidesmosome cell junction bind to in the basement membrane

Answer 22

Laminin

Question 23

Epithelial cells anchor to the ___

Answer 23

Basement membrane

Question 24

The basement membrane is comprised of ___ lamina and ___ lamina

Answer 24

Basal lamina and Reticular lamina

Question 25

The basal lamina is made from proteins supplied by ___

Answer 25

Epithelial cells

Which produce collagen, laminin, proteoglycans, glycoproteins etc.

Question 26

The reticular lamina is made from fibrous proteins supplied by ___

Answer 26

Fibroblasts in the connective tissue (Which produce fibronectin, collagen etc.)

Question 27

Do epithelial cells bind to the basal lamina or the reticular lamina?

Answer 27

Basal lamina

Question 28

Can epithelial tissue contain blood vessels?

Answer 28

No

Question 29

Can epithelial tissue contain nerves?

Answer 29

Yes

Question 30

How do epithelial cells gain nutrients and dispel waste?

Answer 30

The nutrients and waste diffuse into and out of epithelial cells through the basement membrane