Cilia Flashcards
1
Q
What are microvilli?
A
finger-like projections of the apical cell membrane supported by cross-linked actin bundles. They are motile and increase the surface area of absorption.
2
Q
Where are microvilli found?
A
intestinal epithelium and renal tubules.
3
Q
What kind of cytoskeleton molecule make up microvilli?
A
actin
4
Q
What is at the distal end of the actin filament core of microvilli?
A
formin
5
Q
What does formin do?
A
regulates the assembly of the actin filaments at the barbed ends.
6
Q
What is a brush border?
A
a group of closely packed microvilli at the apical domain of intestinal columnar epithelial cells.
7
Q
What do cili consist of?
A
microtubules (an alpha and beta segment)
8
Q
How are the microtubules in cilia arranged?
A
In a circular pattern ( 9 + 2).
