The nervous system is made up of the brain, spinal cord, and nerves. It receives information from both inside and outside the body through sense organs and responds by directing the body to maintain homeostasis. The central nervous system contains the brain and spinal cord as the control center. The peripheral nervous system consists of nerves that branch out from the central nervous system and connect to the rest of the body in 43 pairs, controlling both voluntary and involuntary actions.
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