PHYSIOLOGY
SLIDING FILAMENT MODEL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The bond between the actin and myosin head is broken when ____
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an ATP molecule binds to the myosin head.
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an ATP molecule binds to the actin molecule.
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ADP and phosphate bind to the myosin head.
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an ATP molecule breaks down on the actin molecule.
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Explanation:
Detailed explanation-1: -Explanation: The bond between the actin and myosin head weakens as a result of ADP. ADP stands for Adenosine diphosphate and is a molecule that is released during muscle contraction. This molecule binds to the myosin head, which causes a conformational change that weakens the bond between the actin and myosin head.
Detailed explanation-2: -ATP binding causes the myosin head to detach from the actin. After this occurs, ATP is converted to ADP and Pi by the intrinsic ATPase activity of myosin. The energy released during ATP hydrolysis changes the angle of the myosin head into a cocked position. The myosin head is now in position for further movement.
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