Muscle contraction occurs when muscle fibers get shorter, and muscles are bundles of fibers that can contract. Given these facts, what contracts as it gets shorter among the following options:
- layers of fat
 - Epidermis
 - Veins and arteries.
 - Shortstop
 - Labor
 - Contracts
 - the body's largest organ
 - Bundles of fibers


 

        Bundles of fibers 