A neuron is _________.

• A. A muscle fiber
• B. The basic cell of the nervous system
• C. A type of glial cell
• D. The body's primary nerve

Answer: (B)

Neurons are the basic cells of the nervous system, the essential units that process and transmit information through electrical impulses and synaptic signaling. They’re not muscle fibers, which are the cells that contract to produce movement. They aren’t glial cells, which provide support and nourishment to neurons. And they aren’t a nerve, which is a bundle of many neurons’ axons in the peripheral nervous system. So the neuron’s defining role is as the fundamental cell of the nervous system.