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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.
The Proximal Convoluted Tubule. The first part of the nephron that is responsible for water reabsorption is the proximal convoluted tubule. Filtered fluid enters the proximal tubule from Bowman's capsule.Many substances that the body needs, which may have been filtered out of the blood at the glomerulus, are reabsorbed into the body in this segment.ater is filtered out of the bloodstream at the glomerulus. The water is accompanied by waste products and other substances such as salt and glucose. The filtered substances enter Bowman's capsule, and from there, the renal tubules.