In the Human Nervous System

question 66

Multiple Choice

In the human nervous system:

• A) most of the cells are neurons.
• B) most of the cells are glia cells.
• C) there are almost equal numbers of glia cells and neurons.
• D) the ratio of cells is unknown because of the complexity of the nervous system.

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Definitions:

Cell Body

The spherical part of a neuron that contains the nucleus and connects to the dendrites, which receive messages, and the axon, which sends them.

Axon

A long, slender projection of a nerve cell, or neuron, that typically conducts electrical impulses away from the neuron's cell body.

Dendrites

Dendrites are the branched projections of a neuron that act to conduct the electrochemical stimulation received from other neural cells to the cell body, or soma, of the neuron from which the dendrites project.

Peripheral Nervous System

Of vertebrates, nerves that carry signals between the central nervous system and the rest of the body.