The component of the client’s nephron that acts as a receptor site for the antidiuretic hormone and regulates water balance would be the collecting ducts. It is the part of the kidney that has a series of ducts and tubules that are connects the nephrons to a calyx. These ducts function in the regulation of fluid and electrolyte levels by excretion and reabsorption. The processes that are involved are controlled by the vasopressin and aldosterone hormones. It is the last component of the kidney in regulating the fluids in the body. For humans, it would account to 4 to 5 percent of the reabsorption of sodium and 5 percent for water.