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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.
The heart's primary function is to pump blood to all parts of the body, bringing nutrients and oxygen to the tissues and removing waste products. When the body is at rest, it needs a certain amount of blood to achieve this function.he heart's primary function is to pump blood to all parts of the body, bringing nutrients and oxygen to the tissues and removing waste products. When the body is at rest, it needs a certain amount of blood to achieve this function.