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The contractile vacuole allows free-living protists to expel extra water. <b>The contractile vacuole allows free-living protists to expel extra water <br /></b>.
The permeability of the distal tubule and collecting duct is controlled by ADH. ADH is produced in the hypothalamus and is stored and released from the pituitary gland. ADH increases the permeability of the distal tubule and collecting duct, so more water is reabsorbed. This causes the urine becomes more concentrated.