Action potential (4)
Action potential 4
By the action of the sodium-potassium pump, repolarisation continues until the transmembrane potential is returned to normal levels, i.e. the rest potential. The potassium channels will close when the membrane potential reaches -70mV.
While the potassium channel closes, still some potassium ions can move to the extracellular fluid. This event causes a small hyperpolarisation (-90mV). When the potassium channels are closed, the membrane potential returns to the normal resting level of -70mV.
The loss of positive ions from the interior of a neuron produces
Extra info: The escape of potassium ions from the depolarised neuron cause repolarisation and returns the neuron to its resting potential.