Muscles exert force by
a. expanding in one direction.
b. expanding in either of two directions.
c. pushing in one direction only.
d. pulling in one direction only.
e. pushing or pulling.
D; Muscles can only exert force as the thick and thin filaments pull past each other. Given the design of the muscle fiber, this means that the force of contraction is felt down the length of the fiber. Bundles of fibers are arranged linearly together in the muscle, exerting force in one direction by shortening the muscle.
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