Which of the Following Is True of the Sodium-Potassium Exchange

Multiple Choice

Which of the following is true of the sodium-potassium exchange pump?

A) It maintains sodium at equal intracellular and extracellular levels.
B) It is a passive transport process.
C) It moves sodium into the cell and potassium out of the cell.
D) There is one type of carrier protein for sodium and a different type of carrier protein for potassium.
E) It is an example of active transport.