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(B) When a neuron is at rest,the axonal membrane is more permeable to $K^{+}$ ions and nearly impermeable to $Na^{+}$ ions. This maintains a negative

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Influx of $Na^{+}$ ion

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(B) When a neuron is at rest,the axonal membrane is more permeable to $K^{+}$ ions and nearly impermeable to $Na^{+}$ ions. This maintains a negative charge inside the membrane.When a stimulus is applied at a site on the membrane,the permeability to $Na^{+}$ ions increases rapidly.This leads to a rapid influx of $Na^{+}$ ions into the cell,causing the inner surface of the membrane to become positively charged relative to the outer surface.This reversal of polarity is known as depolarization,which generates an action potential.

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

Similar Questions

In the resting stage of a neuron,the concentration gradient allows the diffusion of which ions?

For the propagation of a nerve impulse along a nerve fiber,what is the sequence of change in the electrical potential difference across the axolemma?

$A$: 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.

$A$ nerve impulse is generated in a nerve fiber when the membrane becomes more permeable to:

During the conduction of a nerve impulse,the action potential results from the movement of

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