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Which of the events below is the FIRST to occur prior to a muscle cell contracting

saraalalwane
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2022-09-20
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Which of the events below is the FIRST to occur prior to a muscle cell contracting?

  1. ATP binds to myosin
  2. ADP detaches from myosin
  3. the active site on actin is exposed.
  4. Ca ++ is released from the sarcoplasmic reticulum.
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saraalalwane
2022-09-20
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D: The release of Ca from where it is stored (in the SR) is necessary before the active binding site of actin can be exposed.

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