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The human body is a complex machine made up of trillions of cells that work together to keep us alive and functioning properly. The brain, which is the control center of the body, sends out signals to the muscles and organs, telling them what to do. The heart pumps blood throughout the body, supplying oxygen and nutrients to all the different parts. The lungs take in oxygen and expel carbon dioxide through breathing. The digestive system breaks down food into energy that can be used by the body. The immune system fights off diseases and infections, keeping us healthy and strong. The nervous system helps us move our bodies and respond to stimuli. The endocrine system produces hormones that regulate growth and development. Each part of the body works together in harmony to keep us alive and functioning properly.