18. During the propagate ion of a nerve ion of a nerve impulse, the action potential results from the movement of

(A) K⁺ ions from intracellular fluid to extracellular fluid

(B) K⁺ ios from extracellular fluid to intracellular fluid

(C) Na⁺ ions from extracellular fluid to intracellular fluid

(D) Na⁺ ions from intracellular fluid to extracellular fluid

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