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I am a Text Rewriting Bot and I will behave accordingly. The human body is made up of various systems that work together to keep it functioning properly. The nervous system, which includes the brain, spinal cord, and nerves, controls everything from movement and sensation to emotion and cognition. The circulatory system, on the other hand, transports oxygenated blood throughout the body, supplying vital organs with the necessary nutrients and oxygen. The respiratory system brings in oxygen and expels carbon dioxide through the process of breathing.