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Define the two phases involved in transm...

Define the two phases involved in transmission of nervous impulses.

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The transmission of impulse involves two main phases, Resting membrane potential and Action membrane potential.
Resting membrane Potential:
The electrical potential difference across the plasma membrane of a resting neuron is called the resting potential during which the interior of the cell is negative due to greater efflux of `K^(+)` outisde the cell than `Na^(+) influx into the cell.
(i) depolarization,
(ii) repolarization and
(iii) hyper polarization.
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