Final answer:
When one is thirsty and osmoreceptors are stimulated, antidiuretic hormone (ADH) is released from the posterior pituitary gland. ADH acts on the kidneys to increase water reabsorption from the urine, resulting in reduced urine volume and water conservation.
Step-by-step explanation:
When one is thirsty and osmoreceptors are stimulated, antidiuretic hormone (ADH) is released from the posterior pituitary gland. The osmoreceptors, which are sensory receptors in the hypothalamus, detect an increase in the concentration of blood plasma and signal the hypothalamus to release ADH. ADH acts on the kidneys to increase water reabsorption from the urine, resulting in reduced urine volume and water conservation.