'The potential difference across the neurone cell membrane while it is at rest.
The ion channels are 'reset'.
The sodium potassium pump returns the membrane to its resting potential an maintains it, until the membrane is excited by another stimulus.
After an action potential,the neurone cell membrane cannot be excited again straight away.
The ion channels are recovering and cannot be made to open.
Sodium ion channels are closed during repolarisation and potassium channels are open during hyperpolarisation.
The period of recovery is called the refractory period.
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