PHYSIOLOGY
SARCOMERE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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This structure covers the myosin binding site on actin
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tropomyosin
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troponin complex
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myosin head
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myosin tail
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Explanation:
Detailed explanation-1: -A protein called troponin is distributed at regular intervals on the tropomyosin. In the resting state, a subunit of troponin masks the active binding sites for myosin on the actin filaments .
Detailed explanation-2: -This action requires energy, which is provided by ATP. Myosin binds to actin at a binding site on the globular actin protein.
Detailed explanation-3: -Ca++ ions are then pumped back into the SR, through the process of active transport, which requires ATP. The lack of Ca++ ions causes the tropomyosin to reshield (or re-cover) the binding sites on the actin strands, allowing the actin (thin) and myosin (thick) interaction to relax, ending the cross-bridge cycle.
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