In the presence of aldosterone, which nephron region reabsorbs the greatest fraction of the filtered Na⁺?

Question

Quizplus · Accepted Answer

The proximal tubule reabsorbs the greatest fraction of filtered Na+ regardless of aldosterone presence, as it reabsorbs about 65-70% of filtered Na+. Aldosterone primarily acts on the distal convoluted tubule and cortical collecting duct to increase Na+ reabsorption, but these regions handle a smaller fraction of the total filtered Na+.

In the Presence of Aldosterone, Which Nephron Region Reabsorbs the Greatest