What is the role of calcium in muscle contraction?
A. It binds to troponin to expose an actin binding site.
B. It binds to tropomyosin to expose a binding site for thick myofilaments.
C. It stimulates the passage of an electrical signal along the length of the sarcolemma.
D. It provides energy for contraction.
E. It binds to troponin to expose a myosin binding site.
Answer: E
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