In excitation-contraction coupling,
A. calcium ions must bind with myosin to expose active sites on actin.
B. myosin heads bind to exposed active sites on actin.
C. cross-bridges form between myosin heads and calcium ions.
D. movement of the troponin-tropomyosin complex causes actin myofilaments to slide.
E. ATP binds to actin myofilaments.
B
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