Na+/K+-ATPase

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For Every three sodium ions that get pumped out of the cell, two potassium ions get pumped into the cell.

The sodium pump removing Na+ (sodium) ions and taking in K+ (potassium) ions

Na+/K+-ATPase (proper name sodium-potassium adenosine triphosphatase, also known as the Na+/K+ pump, sodium-potassium pump, or simply sodium pump, for short) is an enzyme found in the plasma membrane. It moves Na+ (sodium) ions out of the cell and replaces them with K+ (potassium) ions.