Sarcomere Structure

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10 Terms

1
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What is the Z disc?

The boundary of a sarcomere.

2
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Where is the M line located?

At the center of the sarcomere

3
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What is the I band?

The region containing thin filaments without thick filaments.

4
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What is the A band?

The region spanning the full length of thick filaments.

5
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What is the H zone?

The central region of thick filaments without thin filament overlap.

6
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What happens to the I band during contraction?

It becomes narrower.

7
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What happens to the H zone during contraction?

It becomes narrower or may disappear.

8
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What happens to the A band during contraction?

Its width stays the same.

9
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What happens to the Z discs during contraction?

They move closer together.

10
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What is dystrophin?

A protein that helps connect the muscle cytoskeleton to structures supporting the cell membrane.