Which of the following is true of the sodium-potassium exchange pump?
A) It is an example of active transport.
B) It causes the output of cellular energy in the form of ATP.
C) It moves sodium into the cell and potassium out of the cell.
D) It is only found in muscle cells.
E) It maintains sodium at equal intracellular and extracellular levels.

Question

Quizplus · Accepted Answer

The sodium-potassium exchange pump is an example of active transport, which means that it requires energy to move ions against their concentration gradients. The pump uses ATP to move three sodium ions out of the cell and two potassium ions into the cell. This creates a concentration gradient for both sodium and potassium ions, which drives the passive transport of these ions back into the cell. The pump is found in all cells, not just muscle cells.

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