<prompt> The main site of bicarbonate reabsorption is:Proximal convoluted tubule.Distal convoluted tubule.Coical collecting duct.Medullary collecting duct.  <response>: A i.e. Proximal convoluted tubuleAbout 80 to 90 percent of bicarbonate reabsorption occurs in the proximal tubuleQ.Segment HCO3 reabsorbed Na reabsorbedProximal tubule80-90Q60QLoop of Henle thick1030Distal tubule collecting duct.Remainder10 