The Muscular System. Your Muscles. Functions of the Muscular System. A muscle is made of strong tissue that can contract in an orderly way. When a muscle contracts, the cells of the muscle become shorter. When a muscle relaxes, the cells return to their original length.
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Muscle Attach to Bones
Muscles Work in Pairs
Bend Your Arm
Straighten Your Arm
What happens to a muscles when it contracts?
What kind of muscles line blood vessels and many organs?
What is the term used to describe muscles that you can consciously control?