Food and Nutrition  Training and Exercise  Muscles and Anatomy  Fitness Dictionary  Supplements  Forums  Disclaimer	Muscle Muscle is the tissue of the body which primarily functions as a source of power. There are three types of muscle in the body. Muscle which is responsible for moving extremities and external areas of the body is called "skeletal muscle." Heart muscle is called "cardiac muscle." Muscle that is in the walls of arteries and bowel is called "smooth muscle." Back to Glossary of Fitness Index.
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