Nerve impulse
As a result, the current will flow from depolarised part of nerve fibre to polarised part of the nerve fibre in the axoplasm, while current flows in opposite direction on the cell surface. Thus in this way a new action potential is generated up ahead in the nerve fibre. The time taken by the axonal membrane to get polarised again is called the refractory period (1ms). After the refractory period the sodium potassium pump will operate again and the membrane will return to resting state again.