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(C) The generation of an action potential in a neuron is primarily driven by the rapid influx of $Na^+$ ions into the cell.When a stimulus reaches the

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$Na^+$

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(C) The generation of an action potential in a neuron is primarily driven by the rapid influx of $Na^+$ ions into the cell.When a stimulus reaches the threshold level,voltage-gated $Na^+$ channels open,allowing $Na^+$ ions to rush into the axon down their electrochemical gradient.This rapid influx causes depolarization,which determines the rate of rise (slope) and the peak amplitude of the action potential.Therefore,the concentration of $Na^+$ ions in the extracellular fluid is the primary determinant of these parameters.

The rate of rise of action potential and its amplitude are determined by the concentration of

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