Characteristics of Epithelial Tissues III Flashcards Preview

Histology -- Zach H. > Characteristics of Epithelial Tissues III > Flashcards

Flashcards in Characteristics of Epithelial Tissues III Deck (13)
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1
Q

True or False:

Microvilli are motile.

A

False –> microvilli are non-motile

2
Q

What is the primary function of microvilli?

A

Primarily function is to increase the surface area of absorption.

3
Q

Name two areas in the body that you would find simple columnar epithelium with microvilli on the apical surface.

A

Intestinal epithelium and parts of the renal tubule.

4
Q

What are microvilli?

A

Microvilli are finger-like projections of the apical cell membrane supported by cross-linked actin bundles.

5
Q

What protein regulates the assembly of the actin filaments at the barbed ends?

A

Formin

6
Q

What two proteins cross-link the actin filaments in the core of the microvilli?

A

Villin and Fimbrin

7
Q

True of False:

Stereocilia are non-motile.

A

True

8
Q

How many protofilaments make-up the alpha tubule of a doublet?

A

13 protofilaments

9
Q

How many protofilaments make-up the beta tubule of a doublet?

A

10-11 protofilaments

10
Q

What transport protein gives cilia the ability to move?

A

Dynein

11
Q

What is the principal functions of the inner sheath and radial spokes of the axoneme?

A

They stabilize the axonemal bending.

12
Q

Is the B tubule a complete protofilament.

A

No

13
Q

How many protofilaments does each microtubule have?

A

13 protofilaments each