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The nervous system allows us to move, feel, and think, and it is involved in nearly all of the functions of the human body. Nerves communicate signals between the brain and muscles, allowing us to move our hands and feet. Or, they relay messages about the environment through touch, taste, sight, and smell. Nerves can also communicate information about how we are feeling at any particular time and help to maintain homeostasis, or a stable state of equilibrium. ""The Nervous System"" discusses the development and organization of this diverse system, its functions, and potential injuries and complications.