The Sodium - Potassium Pump

What does Sodium do?

helps maintain cell volume

Decrease in cell volume

less water in cytoplasm by increasing pumping and expelling more sodium ions

Sodium

potassium pumps expels unwanted ions, keeps needed one and maintains cell volume

Increase in cell volume

Increase in water in cytoplasm by decreasing pumping and allowing more sodium inside cell

ATP is used for what?

to expel 3 sodium ions for every 2 potassium ions brought into the cell