How many potassium and sodium ions are transported during each cycle via the sodium-potassium pump?

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

Answer: (C)