The document summarizes the main human body systems. It describes the muscular system which consists of about 650 muscles that help with movement and pumping blood. The circulatory system moves blood, nutrients, oxygen and carbon dioxide around the body using the heart, blood vessels and blood cells. The digestive system breaks down food using organs like the mouth, esophagus, stomach and intestines and the urinary system eliminates waste from the kidneys, ureters and bladder. The skeletal system provides structure and movement with 206 bones and the respiratory system takes in oxygen and expels carbon dioxide using the trachea, diaphragm and lungs. The nervous system controls both voluntary and involuntary actions through the brain, spinal cord and nerves.