<prompt> PCT absorbs all except:SodiumGlucoseHydrogen ionsAmino acids  <response>: PCT reabsorbs all of the filtered glucose and amino acids. PCT reabsorbs largest fraction about 67 of the filtered Na, K, Ca2, Cl-, HCO3-, and water H is secreted by the PCT; it is for the re-absorption of the filtered HCO3-. Fluid at the end of the PCT is always Iso-osmotic to plasma. Glomerulotubular balance in the proximal tubule:- This phenomenon tends to minimize the effects of a fluctuating GFR on Na and water excretion, which promotes a constant plasma volume. It maintains Constant fractional reabsorption about 67 of the Filtered Na and water, even if the GFR varies. 