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The human body is an incredibly complex and intricate machine that is capable of performing a wide range of functions without requiring any external input. It is powered by a small organ called the brain, which sends electrical signals to various parts of the body through a network of nerves. This allows for the coordination of movement, sensation, and other bodily processes. The human heart beats around 100,000 times per day, pumping blood throughout the body and supplying oxygen to its cells. The lungs breathe in oxygen and expel carbon dioxide, while the kidneys filter waste products from the blood and excrete them through urine.