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The human body is made up of a complex system that includes various organs, tissues, and cells working together to maintain overall health and well-being. The nervous system consists of the brain, spinal cord, and nerves, which transmit signals throughout the body, enabling us to think, move, and respond to our environment. The circulatory system transports oxygenated blood from the heart to the lungs, where it picks up carbon dioxide, and returns it to the heart through veins. This process is vital for delivering nutrients and oxygen to cells and organs, while also removing waste products.