During an action potential the Na+ current is inward and K+ current is outward.  You may have been surprised to learn that the intracellular concentration of those ions does not change even after many action potentials.  Why not?

Human Physiology: From Cells to Systems (MindTap Course List)
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Chapter4: Principles Of Neural And Hormonal Communication
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Subject: Neurophysiology 

During an action potential the Na+ current is inward and K+ current is outward.  You may have been surprised to learn that the intracellular concentration of those ions does not change even after many action potentials.  Why not? 

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