Which of the following describes the role of myosin in muscle contraction?
A. ATP forms a bridge, binding actin to myosin.
B. Actin heads bend when attached to myosin.
C. Calcium ions form a bridge, moving actin along myosin.
D. Myosin heads bend when attached to actin.
E. Myosin synthesizes new strands of actin, lengthening the muscle.
D. Myosin heads bend when attached to actin.
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