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The distal tubule reabsorbs sodium and bicarbonate and secretes potassium. The final segment of the renal tubule is the collecting tubule, which funnels the remaining filtrate toward the renal pelvis for excretion via the URETER as urine. Only water reabsorption takes place from the collecting tubule.ifferent portions of the loop of Henle reabsorb sodium, potassium, chloride, magnesium, calcium, and water. The loop of Henle plays a significant role in the concentration and dilution of the URINE, and is the target of some types of diuretic medications.
Glucose reabsorption happens to 100% in the proximal tubule using the sodium-glucose-cotransporter. In the case of too high glucose concentration in the serum, this mechanism is subject to saturation and glucosuria results.otassium reabsorption of the kidney. 60â70% of the filtered potassium (K +) is reabsorbed in the proximal tubule. There are no specific K-transporter, reabsorption is managed with the absorption of water (solvent drag).