The nervous system is a complex communication network in the body that controls actions such as movement, sensation, and thought. It is made up of the brain, spinal cord, and a vast network of neurones (nerve cells) that connect all parts of the body. The brain acts like a central computer, sending and receiving messages through the spinal cord and neurones. These messages help you respond to your surroundings—for example, pulling your hand away from something hot or feeling happy when you see a friend. The nervous system also works closely with other systems in the body to maintain balance and respond quickly to changes in the environment.
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