HUMAN PHYSIOLOGY
LOCOMOTION AND MOVEMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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ATP provides energy for muscle contraction by allowing for
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An action potential formation in the muscle cell.
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Cross-bridge detachment of myosin from actin.
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Cross-bridge attachment of myosin to actin.
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Release of Ca2+ from sarcoplasmic reticulum.
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Explanation:
Detailed explanation-1: -ATP enables the actin-myosin cross-bridge to detach, and release energy through its hydrolysis to enable the myosin head to return to its normal position.
Detailed explanation-2: -ATP is used to get the cross-bridges to bind to actin.
Detailed explanation-3: -Myosin heads form a cross-bridge with actin. When the myosin head bends it moves the actin toward the center of the sarcomere. ATP causes myosin to form a cross-bridge with actin.
Detailed explanation-4: -ATP then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site. ATP can then attach to myosin, which allows the cross-bridge cycle to start again; further muscle contraction can occur.
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