Which of the following accurately describes the way in which a muscle moves? A. When actin filaments are pulled toward the cente
r of the sarcomere, the fiber shortens. B. During contraction, cross-bridges pull the myosin to the center of the sarcomere. C. Interaction and attachment between myosin and actin cause a muscle fiber to relax. D. No ATP is needed is the contraction of a muscle.
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