29. What is the function of Ca2+ in muscle contraction?
(A) It binds to myosin to promote its dissociation from actin.
(B) It binds to troponin to trigger a conformational change in a troponin-tropomyosin complex.
(C) It binds to actin to promote its dissociation from myosin.
(D) It binds to myoglobin to promote oxygen binding.
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題目解析 這道題目主要是探討鈣離子（C...
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