HUMAN PHYSIOLOGY
LOCOMOTION AND MOVEMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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a-troponin
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b-tropomyosin
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both a and b
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myofibrils
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Detailed explanation-1: -So, the correct answer is ‘Troponin and tropomyosin’.
Detailed explanation-2: -Regulatory proteins: Include troponin, tropomyosin, M-protein, beta-actin, gamma-actin and C-protein.
Detailed explanation-3: -The binding of the myosin heads to the muscle actin is a highly-regulated process. When a muscle is in a resting state, actin and myosin are separated. To keep actin from binding to the active site on myosin, regulatory proteins block the molecular binding sites.
Detailed explanation-4: -The thin filaments also contain the regulatory proteins called tropomyosin and troponin, which regulate the interaction of actin and myosin. Tropomyosin is a long, double-stranded, helical protein that is wrapped about the long axis of the actin backbone (Figure 2-8, D).