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It is the firing of a nerve which sends an electrical signal down the axons of that nerve. The message propagates by the movement of Sodium (Na) and Potassium (K) ions in and out of the axon wall/sheath.

The electrical messages, called nerve impulses, may travel as fast as 150m per sec or as slow as 0.2m/s
a nerve impulse is an electrical signal that travels along the axon of a neurone to and from receptor.

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