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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.
1 An organ is a collection of different tissues that carries out a particular function (e.g. liver). 2  An organ system is a collection of organs that functions to carry out a specific task in the organism (e.g. digestive system).  At each level of organization, the structure helps determine the function.