The protein that prevents the exposure of myosin binding site of action is _____________.

actin

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tropomyosin

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troponin

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myosin

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Solution

The correct option is A actin
Option (B) is correct. Tropomyosin hinders the cross-bridge formation and contraction of muscle without nervous input thereby blocking myosin binding sites on actin molecules. Troponin binds to tropomyosin and helps to position it on the actin molecule.

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