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The human body is a complex machine that is comprised of trillions of cells, all working together to keep us alive. The heart beats at an average rate of 72 times per minute, pumping blood throughout the body and supplying oxygen and nutrients to our muscles, organs, and tissues. The brain, a mass of nerve tissue, controls everything we do from thinking and moving to feeling emotions and remembering past events. It is protected by the skull, which also houses the eyes, ears, nose, and mouth.