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. 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. When actin filaments are pulled toward the center of the sacomere, the fiber shortens.