Maximum absorption of HCO3- occurs in:: (A) PCT, (B) DCT, (C) collecting duct, (D) ascending limb of the loop of Henle
Answer is A. Bicarbonate: 80% of bicarbonate reabsorption occurs in the PCT, 10% in thick ascending limb of LOH, and remaining in the DCT and collecting duct. Filtered bicarbonate can be reabsorbed only when it combines with H+.