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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.
Kidneys are the most important organs of the excretory system. The function of the kidney is to clean from the blood substances not needed in the body. The kidney is a complex filter, where active and passive mechanisms are involved as well as several complex control mechanisms.