A signal transmitted along a nerve fibre. It consists of a wave of electrical depolarization that reverses the potential difference across the nerve cell membranes.
- The arrival of the nerve impulse, an electrical signal, at the axon activates the influx of calcium ions through voltage-dependent ion channels in the membrane.
- After an action potential has swept along a single nerve fibre, a second nerve impulse cannot be initiated immediately.
- It is the influx of sodium into the cell that is responsible for generating an action potential, which causes depolarization and conduction of the nerve impulse.
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