Chapter37:Neurons and also Nervous Systems

The Nerve Impulse

What is the resource of the electrical impulse in a neuron? The resource of the impulse in a neuron is a rapid readjust in the polarity the the cell membrane in a limited area. The direction the the electric gradient is promptly reversed and then returns to normal. The adjust in fee stimulates the process to happen in surrounding parts of the cell and the change in polarity travels under the neuron. The change in polarity does not go behind – the area instantly ‘behind’ the activity potential is still return to the resting state and also is not engendered to form another activity potential.

You are watching: The nerve impulse is an electrical current that travels along dendrites or axons.

View the animation below, then complete the quiz to check your knowledge of the concept.


Which that the adhering to statements about the resting membrane potential is TRUE?
A)the exterior the the cell has actually a net an unfavorable charge and also the interior has a net optimistic charge
B)the exterior that the cell has actually a net an unfavorable charge and the internal is neutral
C)the exterior the the cell has a net hopeful charge and also the interior has actually a net an adverse charge
D)the exterior of the cell has a net positive charge and the inner is neutral
E)the exterior that the cell is neutral and also the interior has a net negative charge

During depolarization, which of the complying with statements about voltage-gated ion networks is TRUE
A)K+ gateways open before Na+ gates
B)Na+ entrances open prior to K+ gates
C)Na+ and K+ entrances open in ~ the same time
D)Na+ gates open if K+ gates remain closed
E)K+ gates open when Na+ gateways remain closed

Depolarization occurs because
A)more K+ diffuse right into the cell than Na+ diffuse out of
B)more K+ diffuse out of the cell than Na+ diffuse into it
C)more Na+ diffuse right into the cell than K+ diffuse out of it
D)more Na+ diffuse out of the cell than K+ diffuse into it
E)both Na+ and also K+ diffuse right into the cell

The sodium-potassium pump is connected in developing the relaxing membrane potential.
A)True
B)False

The nerve impulse is an electrical present that travels along dendrites or axons.

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A)True
B)False

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