When a muscle is at rest, what blocks myosin from binding to actin?

Acetylcholine

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ATP

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C a^{+ +}

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Troponin

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Solution

The correct option is D Troponin
Troponin blocks myosin binding sites on actin molecules, preventing cross-bridge formation which prevents
contraction in a muscle without nervous input.

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A myosin molecule has________ ATP binding sites and ________actin binding sites

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