Epithelial Tissue and cell junctions for chapter 4 quiz

Avascular

Does not have own blood supply

characteristics of epithelia

• Avascular

• Has nerve endings

• Regenerates via mitosis

• very little extracellular space

The two surfaces of epithelial tissue

Apical surface and Basolateral (Basal) surface

Apical surface characteristics

• Has microvilli

• Has cillia

• top of the epithelial tissue

Basal surface characteristic

It is attached to underlying connective tissue

What forms tight junctions

fused plasma membrane of adjacent cells

Main characteristic of tight junctions

It prevents passage of water and solutes

Nothing gets in between the cells

What are adheren junctions made out of?

• plaque

• actin

• cadherin

• adhesion belt

Function of Adherens junctions

Anchor cells together

Another word for anchoring junctions

Desmosomes

What are anchoring junction made out of?

• cadherin

• plaque

• keratin

Function of desmasomes

• Prevent epidermal cells from separating during tension

• prevents muscle cells from pulling apart during contractions

What are gap junctions made out of?

Channel protiens called connexons

Functions of gap junctions

• Allows rapid communication between cells

• lets things pass through it

• coordinates contractions in heart muscles

What are Hemidesmosomes made out of?

• Keratin

• Integrin

• Plaque

Function of hemidesmosomes

Anchor cells to the basement membrane