An action potential in a nerve fiber is generated when the outer surface is positive and the inner surface is negative,and the membrane potential is reversed because...

During resting potential,the axonal membrane is more permeable to.........

Select the correct sequence of statements regarding the conduction of a nerve impulse and select the correct option given below.
$i.$ Rapid influx of $Na^{+}$ inside the axon.
$ii.$ $Na^{+}$ gates are closed and $K^{+}$ gates open after the refractory period.
$iii.$ Intracellular fluid is electronegative and the potential difference is $-70 \ mV$.
$iv.$ Extracellular fluid becomes electronegative.
$v.$ Disturbance to the resting potential.

During the conduction of a nerve impulse, electrical energy is generated. What is the source of this energy?

Which of the following acts is responsible for the depolarisation of the neuron?

Saltatory conduction occurs in