PHYSIOLOGY
MUSCLE STRUCTURE FUNCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The protein that covers the binding site on actin when a muscle is relaxed is called
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Troponin
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Nebulin
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Tropomyosin
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Myosin
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Explanation:
Detailed explanation-1: -Tropomyosin is a fibrous protein that binds lengthwise along the groove of actin filaments . In striated muscle, each tropomyosin molecule is bound to troponin, which is a complex of three polypeptides: troponin C (Ca2+-binding), troponin I (inhibitory), and troponin T (tropomyosin-binding).
Detailed explanation-2: -In a relaxed muscle, the troponin-tropomyosin complex prevents the myosin heads from binding to the active sites on the actin microfilaments.
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