<prompt> Least reabsorption out ofGlucoseUreaNaHCO3  <response>: Reabsorption the flow of glomerular filtrate from the proximal tubule of the nephron into the peritubular capillaries, which allows the selective passage of ceain substances glucose, proteins, sodium back into the circulation. Urea is least reabsorbed as it is excreted out. Ref: Ganongs review of medical physiology; 24th edition 