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Nerve impulses

A nerve impulse is an electrical signal that travels along an axon. There is an electrical difference between the inside of the axon and its surroundings, like a tiny battery. When the nerve is activated, there is a sudden change in the voltage across the wall of the axon, caused by the movement of ions in and out of the neurone. This triggers a wave of electrical activity that passes from the cell body along the length of the axon to the synapse.

A nerve impulse is a wave of electrical activity that passes from one end of a neurone to the other.

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