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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