Describe the role of ADH in the regulation of urine concentration.

Step by Step Solution: Step 1. ADH stands for Antidiuretic Hormone. Step 2. It is produced by the hypothalamus and released by the posterior pituitary gland. Step 3. ADH acts on the kidney tubules to increase their permeability to water molecules. Step 4. As a result, more water is reabsorbed back into the bloodstream instead of being excreted in urine. Step 5. This makes the urine more concentrated. Step 6. If the body needs to conserve water, more ADH is released to increase the reabsorption of water and produce less urine. Step 7. If the body has excess water, less ADH is released to decrease the reabsorption of water and produce more urine. Step 8. In summary, ADH plays a crucial role in maintaining the water balance of the body by regulating urine concentration.