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The Muscular system is the organ system whose primary function is movement and flexibility. The muscular system is made up of the muscles that let you move. There are three kinds of muscle in your body. Smooth muscle moves food through the digestive system.Cardiac muscle pumps blood throughout the body.he Muscular system is the organ system whose primary function is movement and flexibility. The muscular system is made up of the muscles that let you move. There are three kinds of muscle in your body. Smooth muscle moves food through the digestive system.
Muscles are the only tissue in the body that has the ability to contract and therefore move the other parts of the body. Related to the function of movement is the muscular systemâs second function: the maintenance of posture and body position.uscles are the only tissue in the body that has the ability to contract and therefore move the other parts of the body. Related to the function of movement is the muscular systemâs second function: the maintenance of posture and body position.