PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following best describes the power stoke?
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actin’s troponin pulls on the myosin filament
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myosin heads pull on binding sites of the actin filament
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -The power stroke occurs when ADP and phosphate dissociate from the myosin head.
Detailed explanation-2: -Answer and Explanation: Each myosin head has a binding site for A) actin and ATP. Myosin binds to ATP and uses it for energy to initiate binding to actin and the subsequent powerstroke, causing muscle contraction. Calcium is involved in this process, however it binds to troponin C, a regulatory molecule found on actin.
There is 1 question to complete.