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The human body is a complex system that is made up of many different parts, each one working together to keep us alive and functioning properly. The brain is the control center of the body, sending out signals to muscles and organs throughout the body to tell them what to do. The heart pumps blood through the circulatory system, supplying oxygen and nutrients to the body's cells. The lungs breathe in oxygen and breathe out carbon dioxide, keeping the body's air supply fresh and clean.