In nerve , the magnitude of the action potential overshoot is normally a function of the______________?
Correct answer: A. extracellular sodium concentration
- A. extracellular sodium concentration
- B. Intracellular potassium concentration
- C. Magnitude of the stimulus
- D. resting membrane potential
Explanation
The action-potential overshoot depends mainly on the sodium equilibrium potential, so it varies with the extracellular sodium concentration. Stimulus strength affects whether an action potential occurs, but not its normal size once threshold is reached.
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