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Identify TWO events during muscle contraction when ATP is required.

Identify TWO events during muscle contraction when ATP is required.

Science   Anatomy-And-Physiology   
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Answer #1

The three main function of ATP in muscle contraction are

(1) Its hydrolysis by an ATPase activates the myosin head so it can bind to actin and rotate;

(2) Its binding to myosin causes detachment from actin after the power stroke

(3) It powers the pumps that transport calcium ions from the cytosol back into the sarcoplasmic reticulum.

If ATP were not available, the cross-bridges would not be able to detach from actin. The muscles would remain in a state of rigidity, as occurs in rigor mortis.

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