Free The Nervous System, Hormones and Homeostasis Quiz

Coordination, Response, and Homeostasis

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The diagram below shows the structure of a motor neurone (motor nerve cell).

The axon of this neurone is wrapped at intervals with an insulating sheath, made mainly of fatty material, with small uninsulated gaps left between each segment. Which of the following correctly describes the main effect of this insulating sheath on nerve impulse transmission?

Select one option.

It slows down the nerve impulse, allowing more time for a considered response.
It converts the electrical nerve impulse into a chemical signal along the entire length of the axon.
It greatly increases the speed of nerve impulse transmission, because the impulse jumps rapidly from one uninsulated gap to the next rather than travelling continuously along the whole membrane.
It has no effect on the speed of transmission but instead increases the strength of the impulse.
It prevents the neurone from ever transmitting more than one impulse in its entire lifetime.

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