What do muscle fibers need to do to enable movement?
Options:
- (A) Bend
- (B) strength
- (C) exercise
- (D) ligt
- (E) It expands
- (F) shorten
- (G) Vibrates
- (H) stay warm Let's be accurate as possible.
Muscle contraction occurs when muscle fibers get shorter. Movement is based on the contraction of muscles. Movement happens when muscle fibers get shorter.
The final answer: (F).