What Is the Sodium-Potassium Pump

What is the sodium-potassium pump?

A) A cell membrane protein that uses energy to pump sodium into the cell
B) A cell membrane protein that uses energy to pump sodium out of the cell
C) A mechanism present throughout interstitial fluid for draining sodium from the circulation
D) A mechanism present in the kidneys that exchanges sodium with lactic acid in order to regulate organic acid concentration

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