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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 extracellular fluid to intracellular fluid

Solution

The rising phase of an action potential is caused by sodium ions entering the neuron from the extracellular fluid through voltage-gated Na+ channels. This inward Na+ movement depolarizes the membrane and produces the nerve impulse.

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