How many sodium ions are moved out of the cell and how many potassium ions are moved into the cell by the sodium-potassium pump?

• A. 2 sodium ions in, 3 potassium ions out
• B. 2 sodium ions out, 3 potassium ions in
• C. 3 sodium ions in, 2 potassium ions out
• D. 3 sodium ions out, 2 potassium ions in

Answer: (D)