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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:

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