<prompt> HCO3 is absorbed through?PCTDCTLoop of henleCollecting duct  <response>: Ans. a PCTRef: Ganong 25th ed. 713 80-90 of bicarbonate is reabsorbed in PCT. Absorption of HCO3 is indirect due to secretion of H by PCT H HCO3 H2CO3 - H2O CO2 - CO2 diffuses into epithelial cell and generate HCO3 ion which is then reabsorbed.Also Know PCT reabsorbs: Na Cl, HCO3, PO4, K,Glucose and amino acid PCT secrets: H ion, organic acid and bases oxalate, urate PCT is highly permeable to water. 