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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.
1 PCT reabsorbs 2/3 of the filtered Na or (65-80% of Na) and H2O. 2  It reabsorbs all of the glucose, and amino acids. 3  glucose is reabsorbed via Na-Glu cotransporter. 4  It also reabsorbs a fraction of the bicarbonate, potassium, phosphate and calcium.5  It secretes ammonia, which functions as a buffer for secreted H+.luid that is filtered from the Bowmanâs Capsule enters into the proximal tubule. It contains brush border, and is made up of cubiodal epithelium. It has an acidophilic cytoplasm due to the number of mitochondria.