HCO₃- reabsorption in the proxim al tubule A) Requires acid secretion at the luminal membrane B) Requires a HCO₃^-- Cl^- exchanger at the luminal membrane C) Requires a HCO₃^- - Cl^- exchanger at the basolateral membrane D) Requires carbonic anhydrase in the plasma E) Requires Na⁺ secretion

Question

Quizplus · Accepted Answer

The reabsorption of bicarbonate (HCO3-) in the proximal tubule involves the secretion of hydrogen ions (H+) into the tubular lumen, which combines with filtered bicarbonate to form carbonic acid. This process is facilitated by carbonic anhydrase, which catalyzes the conversion of carbonic acid to water and carbon dioxide, allowing for the reabsorption of bicarbonate.

HCO3- Reabsorption in the Proxim Al Tubule

HCO₃- Reabsorption in the Proxim Al Tubule