PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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____ attaches to actin to form the cross bridge.
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Troponin
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Tropomyosin
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Myosin
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Calcium
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Explanation:
Detailed explanation-1: -Once tropomyosin has moved out of the way, the myosin heads can bind to the exposed binding sites on the actin filaments. This forms actin-myosin cross-bridges and allows muscle contraction to begin.
Detailed explanation-2: -ATP binding causes myosin to release actin, allowing actin and myosin to detach from each other.
Detailed explanation-3: -The first step in the process of contraction is for Ca++ to bind to troponin so that tropomyosin can slide away from the binding sites on the actin strands. This allows the myosin heads to bind to these exposed binding sites and form cross-bridges.
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