PHYSIOLOGY
MUSCLE STRUCTURE FUNCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The power stroke will occur when
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ATP binds to the myosin head
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The myosin head hydrolyses ATP into ADP and Pi
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The myosin head releases Pi
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The myosin head releases ADP
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Explanation:
Detailed explanation-1: -The power stroke occurs when ADP and phosphate dissociate from the myosin head. The power stroke occurs when ADP and phosphate dissociate from the actin active site. The power stroke occurs when Ca2+ binds the calcium head.
Detailed explanation-2: -The hydrolysis of ATP takes several steps: ATP binds to the myosin head (the “business” end of the molecule), it is then and hydrolyzed to ADP and Pi, which remain noncovalently bound. Then the myosin releases the products as free ADP and Pi. The step that limits the speed of this reaction is the release of ADP and Pi.
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