Potassium
A) is actively reabsorbed in the proximal tubule
B) is actively secreted in the distal and collecting tubules
C) secretion is controlled by aldosterone
D) is filtered, reabsorbed, and secreted in the kidney
E) all of these

Question

Quizplus · Accepted Answer

Potassium is filtered at the glomerulus and then reabsorbed in the proximal tubule. However, the majority of potassium handling occurs in the distal tubule and collecting ducts, where it is actively secreted with the help of aldosterone. Therefore, all of the choices are correct.