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During the propagation of a nerve impulse, the action potential results from the movement of:

1. K+ ions from extracellular fluid to intracellular fluid
2. Na+ ions from intracellular fluid to extracellular fluid
3. K+ ions from intracellular fluid to extracellular fluid
4. Na+ ions from extracellular fluid to intracellular fluid

Correct answer: Na+ ions from intracellular fluid to extracellular fluid

Solution

The movement of sodium ions out of the cell is responsible for the depolarization of the cell membrane during an action potential.

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