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. One phosphate group is still bound to the pump.

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.