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19 September, 12:21

Arrange the steps in correct order to explain how a muscle fiber contracts

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  1. 19 September, 16:04
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    Calcium ions rush into muscle fibers.

    Calcium binds to troponin.

    Troponin changes shape and exposes actin binding site.

    Myosin heads bind to actin binding site making a cross bridge.

    Myosin heads do a powerstroke (using ADP and P) which slides actin and decreases length of sarcomere (Z line to Z line)
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