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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.
CELLS. TISSUES. ORGANS. FIND OUT MORE. Our body structures are arranged into several different systems, each with its own specific function. The smallest units in the body are CELLS, which share certain characteristics. These tiny structures are collected into TISSUES, which are themselves arranged into ORGANS. Different body systems consist of collections of cells, tissues, and organs with a common purpose.