Epithelial Tissue III (exam 1) Flashcards

1
Q

what are microvilli supported by

A

Cross-linked actin bundles

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2
Q

Are microvilli motile

A

No

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3
Q

Microvilli tend to form what cross the apical membrane

A

Brush border

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4
Q

What is microvilli primary function

A

to increase the surface are of absorption

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5
Q

Where are microvilli typically found

A

on the intestinal epithelium and on parts of renal tubules

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6
Q

what is the microvilli core composed of

A

Actin filament which extends into the terminal web

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7
Q

What is the terminal web

A

A network of cytoskeletal proteins (such as keratins) under the apical membrane of the cell

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8
Q

The distal end of the actin filament core in microvilli is capped by _______ and what is the caps function

A

Formin
Formin interacts with the barbed ends of the actin filaments
Formin regulates the assembly of the actin filaments at the barbed ends

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9
Q

The actin filaments that make up the core of the microvilli are cross-linked by what

A

Villain and fimbrin

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10
Q

what is the structure of a cilium

A

9 peripheral doublets with a central pair of microtubules

- each doublet consists of alpha tubule and beta tubule

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11
Q

Describe the structure of the alpha tubule in each of the 9 peripheral doublets of a Cilium

A

13 protofilaments
Radial spokes extending to sheath around central pair
Pair of dyne arms projecting to beta unit of next doublet

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12
Q

Describe the structure of a beta tubule in each of the 9 peripheral doublets of a Cilium

A

10-11 protofilaments

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13
Q

What do cilia develop from

A

Basal bodies

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