Fact 1: Muscle contraction occurs when muscle fibers get shorter.

Fact 2: Contraction of the muscle straightens the leg.

Given the two facts above, answer the question "What happens to your leg when muscle fibers shorten?" with the following options: 
- they bend
 - It decreases
 - It straightens
 - permineralization
 - It expands
 - Damages them
 - Localized damage
 - Dehydration


 

   It straightens      