What is the main function of the Collecting Duct in urine formation?

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Collecting Duct: This long duct extends from the cortex of the kidnney to the inner parts of the medulla. Large amounts of water could be reabsorbed from this region to produce a concentrated urine. This segment allows passage of small amounts of urea into the medullary interstitium to keep up the osmolarity. It also plays a role in the maintenance of pH and ionic balance of blood by the selective secretion of H+ and K+ ions. Collecting Duct: This long duct extends from the cortex of the kidney to the inner parts o