This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
In nerve, the magnitude of the action potential overshoot is normally a function of the 
Select and explain. 
A. Magnitude of the stimulus, B. Intracellular potassium concentration, C. Extracellular sodium concentration, D. resting membrane potential
C: Extracellular sodium concentration
Answer: C: Extracellular sodium concentration 
Explanation: None