Answer. Normally, at rest the
membrane is more positive outside and more negative inside, such
state is known as the resting potential or the polarised state. As
the sodium ions are more on the outer side and potassium is less on
the inner side.
As stimulus is received, polarity
changes the outer membrane becomes negative and inner membrane
becomes positive, this state is known as the depolarized state or
the action potential. As this action potential propagates further
the membrane again becomes polarised from the back region.
Polarisation, depolarisation
and repolarisation helps in the transmission of nerve impulse
across the neuron through synapse.
