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11.41: Nerve Cells and Nerve Impulses

Difficulty Level: At Grade Created by: CK-12
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Vocabulary

axon

Long, threadlike part of a neuron that transmits nerve impulses to other cells.

cell body

Central part of a neuron that contains the nucleus and other cell organelles.

dendrite

Extension of the cell body of a neuron that receives nerve impulses from other neurons.

motor neuron

Nerve cell that carries nerve impulses from the brain and spinal cord to organs, glands, and muscles.

myelin sheath

Fatty layer that insulates the axon and allows the electrical signal to travel much more quickly.

nerve

Bundle of nerve cells.

nerve impulse

Electrical signal transmitted by the nervous system.

neuron

Nerve cell.

neurotransmitter

Chemical that carries a nerve impulse from one nerve cell to another at the synapse.

node of Ranvier

Any gap within the myelin sheath exposing the axon.

sensory neuron

Nerve cell that carries nerve impulses from the sense organs and internal organs to the brain and spinal cord.

synapse

Place where the axon of one neuron meets the dendrite of another.

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Difficulty Level:
At Grade
Grades:
7 , 8
Date Created:
Nov 29, 2012
Last Modified:
Aug 30, 2016
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