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Hyperpolarisation

When the potassium voltage-gated channels open, lots of potassium ions diffuse out of the axon down their electrochemical gradient.This causes the inside of the axon to become more negative than the resting potential i.e. the membrane becomes hyperpolarised.The potassium voltage-gated channels then close and the sodium-potassium pump restores the membrane to its resting potential.

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Specification: AQA Biology (7402), A-level, 3.6.2.1 Nerve impulses. Topic: Neuronal Communication.

Key terms in this lesson

rubp
Ribulose bisphosphate, the five-carbon molecule that combines with carbon dioxide in the Calvin cycle, in a reaction catalysed by rubisco.
gp
Glycerate 3-phosphate, the three-carbon compound formed when RuBP combines with carbon dioxide in the Calvin cycle.

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