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What is the role of calcium in muscle contraction?A.Calcium binds to tropomyosin to expose the myosin-binding sites on actin.B.Calcium is released from the sarcoplasmic reticulum to initiate the sliding of actin and myosin filaments.C.Calcium activates the motor neurons to stimulate muscle contraction.D.Calcium is required for the relaxation of muscles after contraction.

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