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Full Text. Hormonal Regulation of the Excretory System. Maintaining a proper water balance in the body is important to avoid dehydration or over-hydration (hyponatremia). The water concentration of the body is monitored by osmoreceptors in the hypothalamus, which detect the concentration of electrolytes in the extracellular fluid.
That water concentrations are regulated by a hormone called ADH. That ADH effects the permeability of the distal convoluting tubule and the collecting duct. That aldosterone controls sodium concentrations in the blood. The Collecting Duct Hormones control the permeability of the walls of the collecting duct.If the walls are water-permeable, water leaves the ducts to pass into the hyperosmotic surroundings and concentrated urine is produced.If the ducts are impermeable to water the final urine will be less concentrated.he Collecting Duct Hormones control the permeability of the walls of the collecting duct. If the walls are water-permeable, water leaves the ducts to pass into the hyperosmotic surroundings and concentrated urine is produced. If the ducts are impermeable to water the final urine will be less concentrated.