Na+/K+-ATPase

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

Na+/K+-ATPase is an enzyme found in the plasma membrane. It is sodium-potassium adenosine triphosphatase, also known as the 'Na+/K+ pump', 'sodium-potassium pump', or simply 'sodium pump', for short.

The enzyme moves Na+ (sodium) ions out of the cell and replaces them with K+ (potassium) ions. This keeps the Na+ ions outside of the cell membrane, and keeps the K+ ions on the inside of the cell membrane. The process works in the opposite direction of diffusion.[1]

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.

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