In which condition,the axonal membrane is comparatively more permeable to potassium ions and nearly impermeable to sodium ions?

During the conduction of a nerve impulse along a neuron,what is the nature of the electrical charge on the inner side of the plasma membrane?

For visual sense,the nerve impulse is generated by

The action potential of a neuron is generated by which of the following?

At the site of stimulation,the charge of the inner and outer surface of the membrane becomes reversed due to:

$A$: In the nervous system,the generation of an action potential depends upon the influx of sodium ions into the axoplasm.
$R$: The influx of sodium ions during nerve impulse generation is due to the efflux of potassium ions.