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