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The human body is a complex and dynamic system that consists of many different organs, tissues, and systems working together to maintain overall health and function. The brain, spinal cord, and nerves make up the central nervous system, which sends and receives signals throughout the body. Organs such as the heart, lungs, liver, and kidneys perform various functions necessary for survival, while muscles and bones provide structure and movement. The skin protects the body from external damage, and the digestive system breaks down food into nutrients that can be absorbed by the body. Overall, the human body is a remarkable machine that requires careful maintenance to function properly.