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63. Which of the following best describes the role of Ca2+ in muscle contraction?a. It binds to tropomyosin, moving troponin, so that myosin heads can bind to actinb. It binds to tropomyosin, moving troponin, so that actin heads can bind to myosinc. It binds to troponin, moving tropomyosin, so that myosin heads can bind to actind. It binds to troponin, moving tropomyosin, so that actin heads can bind myosine. It binds to action, moving myosin, so that troponin can bind to tropomyosin
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