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The human body is a complex machine that is capable of performing an incredible number of tasks. From the moment we are born until the day we die, our bodies are constantly working to keep us alive and functioning properly. The heart pumps blood throughout the circulatory system, delivering oxygen and nutrients to every cell in the body. The lungs breathe in oxygen and expel carbon dioxide through a process called respiration. The brain thinks and processes information, controlling everything from movement to emotions. The digestive system breaks down food into its component parts, providing energy for the body. And the immune system fights off infections and diseases that could harm us. Each of these systems works together in perfect harmony to keep the human machine running smoothly.