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Describe the events that take place in a neurone which produce an action potential

- The action potential begins when the stimulus exceeds the threshold.

- The voltage gated sodium ion channels open.

- Sodium ions diffuse into the axon down an electrochemical gradient.

- Positive feedback occurs (more sodium ion channels open).

- This depolarises the membrane.

- The membrane potential reverses from -65mV to +40mV.

- The voltage gated potassium ion channels now open.

- Potassium ions diffuse out of the axon down an electrochemical gradient.

- The sodium ion channels close.

- Hyperpolarisation occurs.

- But the sodium potassium pump then restores the resting potential by   actively transporting 3 Na+ out of the axon and 2K+ into the axon.

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