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):
1

True or False:

Microvilli are motile.

False --> microvilli are non-motile

2

What is the primary function of microvilli?

Primarily function is to increase the surface area of absorption.

3

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

Intestinal epithelium and parts of the renal tubule.

4

What are microvilli?

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

5

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

Formin

6

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

Villin and Fimbrin

7

True of False:

Stereocilia are non-motile.

True

8

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

13 protofilaments

9

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

10-11 protofilaments

10

What transport protein gives cilia the ability to move?

Dynein

11

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

They stabilize the axonemal bending.

12

Is the B tubule a complete protofilament.

No

13

How many protofilaments does each microtubule have?

13 protofilaments each