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The human body is a marvel of engineering and complexity. It's made up of trillions of cells that work together to keep us alive. The brain, which weighs about three pounds, controls everything from our thoughts and emotions to our movements and sensations. The heart pumps blood throughout the body, supplying oxygen and nutrients to our cells. Our lungs take in oxygen and expel carbon dioxide. The digestive system breaks down food into nutrients that can be absorbed by the body.