Describe the role of ADH in maintaining water balance in the body.

ADH helps regulate water balance by controlling the amount of water reabsorbed in the kidneys. When the body is dehydrated, ADH levels increase, leading to more water being reabsorbed, which concentrates the urine. Conversely, when there is excess water, ADH levels decrease, resulting in more dilute urine.

This answer effectively describes the function of ADH in water regulation, highlighting its importance in maintaining homeostasis. The question assesses the student's ability to recall and explain the physiological role of a specific hormone.