In order to maintain cellular homeostasis,an exchange pump ejects ________ ions from the cell and imports ________ ions.
A)potassium; calcium
B)sodium; calcium
C)potassium; sodium
D)sodium; potassium
E)calcium; sodium

Question

Quizplus · Accepted Answer

The exchange pump mentioned in the question is referring to the sodium-potassium pump, which ejects three sodium ions and imports two potassium ions, in order to maintain a concentration gradient across the cell membrane. Therefore, the correct answer is D, sodium ions are ejected and potassium ions are imported.

In Order to Maintain Cellular Homeostasis,an Exchange Pump Ejects ________