Final answer:
Angiotensin II is a vasoconstrictor that increases blood pressure and volume by stimulating the release of hormones that promote water reabsorption and fluid consumption.
Step-by-step explanation:
Angiotensin II is a powerful vasoconstrictor that increases blood pressure and stimulates the release of ADH and aldosterone. ADH increases the reabsorption of water, increasing blood volume and pressure. Angiotensin II also stimulates the thirst center, leading to increased fluid consumption and further increasing blood volume and pressure.