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nervous system

The Nervous System
Image: iStockphoto.com/Eraxion

The Nervous System

Unless you’re a sea sponge or a similar simple organism, you have a nervous system. In humans, the system has two main divisions: the central nervous system, composed of the brain and spinal cord, and the peripheral nervous system, made up of nerves which connect the central nervous system to other parts of the body.

The basic component of the nervous system is the neuron, or nerve cell, which communicates through electrochemical signals.


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