BRAINCAKENerve Impulse
A nerve impulse is an action potential that starts at one end of the neurone and is propagated along the axon to the other end of the neurone.
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Key terms in this lesson
- action potential
- A rapid, temporary reversal of the electrical charge across an axon membrane (depolarisation followed by repolarisation) that occurs when a stimulus exceeds the threshold value.
- depolarisation
- A change in the potential difference across a membrane that makes the inside less negative (or positive) relative to the outside, caused by an influx of sodium ions.
More in Neuronal Communication
- Depolarisation
- Repolarisation
- Hyperpolarisation
- The Action Potential
- Saltatory Conduction
- Synapses
- Neurotransmitters
- Transmission of Impulse across Synapse
All 38 lessons in Neuronal Communication · All AQA A-level Biology topics