Question

muscles are able to contract and relax to bring about movements

Answer 1

During a concentric contraction, a muscle is stimulated to contract according to the sliding filament theory. This occurs throughout the length of the muscle, generating a force at the origin and insertion, causing the muscle to shorten and changing the angle of the joint.

Answer 2

The works with the skeletal system to allow move- ment. Like all muscles, the muscles that produce movement are made up of individual cells called muscle fibers. These fibers contract and relax. ... As they contract, muscles shorten, pulling against bones

Hope it helps..!!
Plz mark as brainliest..