PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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a protein that helps to position tropomyosin on the actin filament
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globulin
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myoglobin
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troponin
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dystrophin
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Explanation:
Detailed explanation-1: -In striated muscle, Ca2+ controls the position of tropomyosin on F-actin via the troponin complex. The troponin complex consists of three subunits: tropomyosin-binding (TnT), inhibitory (TnI), and Ca2+ sensor (TnC).
Detailed explanation-2: -Binding myosin shifts tropomyosin from the closed state (where myosin binds actin only weakly) to the open state (where myosin binds actin strongly) (4, 5).
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