The sodium-potassium pump, shown below, is a mechanism that allows cells to move sodium ions out of the cell and potassium ions into the cell, against a concentration gradient (i. e., from a low concentration to a high concentration).

picture of sodium pump

this mechanism maintains the correct concentrations of sodium and potassium ions inside of a nerve cell. although this pump uses energy, it is necessary to maintain these conditions so nerve impulses can be transmitted properly.

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