Answer:
The basic unit of the nervous system is a nerve cell, or neuron. The human brain contains about 100 billion neurons.
A neuron has a cell body, which includes the cell nucleus, and special extensions called axons (pronounced AK-sonz) and dendrites (pronounced DEN-drahytz). Bundles of axons, called nerves, are found throughout the body. Axons and dendrites allow neurons to communicate, even across long distances.
Explanation:
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