PHYSIOLOGY
SARCOMERE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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water
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ATP
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sodium
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calcium
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Detailed explanation-1: -This results in the myosin head pivoting toward the center of the sarcomere, after which the attached ADP and phosphate group are released. (d) A new molecule of ATP attaches to the myosin head, causing the cross-bridge to detach.
Detailed explanation-2: -Once the myosin forms a cross-bridge with actin, the Pi disassociates and the myosin undergoes the power stroke, reaching a lower energy state when the sarcomere shortens. ATP must bind to myosin to break the cross-bridge and enable the myosin to rebind to actin at the next muscle contraction.
Detailed explanation-3: -After myosin changes its shape, ATP binds to the myosin head. That binding of ATP to myosin releases the myosin from actin, and that changes the cross-bridge to its detached state.