Final answer:
ADH is a hormonal regulator of blood flow that acts on the kidneys to increase water reabsorption and regulate blood volume and pressure.
Step-by-step explanation:
ADH (antidiuretic hormone) would be considered a hormonal regulator of blood flow. It is released by the hypothalamus and acts on the kidneys to increase water reabsorption.
This helps to regulate blood volume and blood pressure. ADH is also known as vasopressin, as it can constrict blood vessels.