When an impulse passes,the membrane is depolarized and the charge of the cells is

If the inside of the membrane becomes more negative,it leads to:

$A$: Presence of myelin sheath increases the rate of conduction of nerve impulse.
$R$: Ionic channels are absent in the area covered by myelin sheath; therefore,depolarization occurs only at the nodes of Ranvier,resulting in saltatory or jumping conduction.

An action potential in a nerve fiber is generated when the $+ve$ and $-ve$ charges on the outside and inside of the axon membrane are reversed because ...........

Resting membrane potential is maintained by

During the propagation of a nerve impulse,the action potential results from the movement of which of the following?