In a nerve cell, what primarily determines the size of the action potential overshoot?

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Strength of the applied stimulusLevel of potassium inside the cellConcentration of sodium outside the cellInitial resting membrane voltage

Explanation

The amplitude of the action potential overshoot is mainly influenced by the extracellular sodium concentration because sodium ions entering the cell during depolarization cause the membrane potential to become positive. Other factors like stimulus strength, intracellular potassium levels, or resting membrane potential have less direct impact on the overshoot magnitude.