Final answer:
ADH can change the osmolarity of blood by regulating water reabsorption in the kidneys.
Step-by-step explanation:
False. ADH, or antidiuretic hormone, can change the osmolarity of blood. ADH plays a role in regulating water balance in the body by causing the kidneys to reabsorb water. When blood osmolarity is high, such as during dehydration or after consuming a very salty meal, ADH is released to increase the reabsorption of water from the urine, which decreases the osmolarity of blood. This process helps maintain proper blood osmolarity and prevent changes that could be harmful to the body.