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it comes closer and m line becomes dense

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Q: What happens to z line disc during contraction?
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What happens to a Z line during contraction?

the Z line discs come closer together and the & the width of the I band decreases.. or narrows


Describe which bands and zones of a sarcomere stay the same and which narrow or disappear during muscle contraction?

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Yes the H band shortens. During contraction the length of the sarcomere or from z line to z line must decrease in length. Thus the I band which is bisected by the z line must shorten as well as the H band, even though the H band is bisected by the A band it must shorten to allow fior this decrease in length. The A band does not shorten because it is composed of the entire length of myosin whose length never decreases during contraction.


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