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