PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Calcium
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ATP
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Tropomyosin
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Acetylcholine
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Detailed explanation-1: -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.
Detailed explanation-2: -ATP binding causes myosin to release actin, allowing actin and myosin to detach from each other. After this happens, the newly bound ATP is converted to ADP and inorganic phosphate, Pi. The enzyme at the binding site on myosin is called ATPase.
Detailed explanation-3: -1B), which connects the u50 domain to the central body. ATP binds between two loops, the switch-1 loop and the P loop (so called for phosphate binding and conserved in nucleotide-binding proteins) at the heart of the myosin head.