Sarcomere Before and After Contraction

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8 Terms

1
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Which sarcomere region becomes shorter during muscle contraction?

I Band

2
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What happens to the H zone during contraction?

It disappears or becomes very narrow

3
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Which part of the sarcomere remains the same length before and after contraction?

A band

4
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During contraction, the Z line moves….

Closer together

5
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What happens to thin filaments (actin) during contraction?

They slide toward the M line

6
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What structural changes allows sarcomeres to shorten?

Thin filaments slide past thick filaments

7
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During contraction, what happens to overlap between thick and thin filaments?

Overlap increases

8
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When the muscle relaxes, what happens to the Hzone?

It reappears