47. In chemical terms how is
the neuronal repolarization
achieved?

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Repolarization is the return the
membrane potential from action
potential (+35 mV) the resting
potential (-70 ).

When the membrane reaches action
potential voltage-gated sodium
close and voltage-gated potassium
open. So sodium stops
into the cell and
starts to exit. Therefore
repolarization is due to of
potassium cations from cell.

The repolarization causes potential
difference temporarily to under
–70 mV, below resting potential, a
phenomenon as
hyperpolarization.