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27 December, 23:27

Muscles are relaxed when ... ?

myosin is not bound to actin

myosin is bound to actin

cross bridges have formed

myosin has bent toward the center of the sarcomere

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Answers (1)
  1. 28 December, 02:45
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    myosin is not bound to actin

    Explanation:

    When the muscle relaxes the verve stimulation stops and the calcium is then pumped back into the sarcoplasmic reticulum which causes a break in the link between actin and myosin. Actin and myosin, therefore, return to their unbound state causing the muscle to relax.
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