Biology, asked by ursrandhir8233, 10 months ago

Muscle contraction and relaxation in

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Answered by anushkakumari3108
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Relaxation of a Muscle Fiber. Ca++ ions are pumped back into the SR, which causes the tropomyosin to reshield the binding sites on the actin strands. A muscle may also stop contracting when it runs out of ATP and becomes fatigued. The release of calcium ions initiates muscle contractions.

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