What do muscle fibers need to do to enable movement?\nOptions:\n- (A) Bend\n- (B) strength\n- (C) exercise\n- (D) ligt\n- (E) It expands\n- (F) shorten\n- (G) Vibrates\n- (H) stay warm
A step-by-step solution is:
(F)
Muscle contraction occurs when muscle fibers get shorter.

Movement is based on the contraction of muscles.

Movement happens when muscle fibers get shorter.

.

So, the final answer is (F)