Maximum reabsorption of HCO3 - occurs in: (A) PCT, (B) DCT, (C) CD, (D) Loop of henle
Answer is A. The process of bicarbonate reabsorption occurs predominantly in the proximal tubule (about 90%). The rest occur in the thick ascending limb and in the collecting tubule. All involve hydrogen ion secretionRef: Ganong&;s Review of Medical Physiology, 23rd edition, page no: 680