Ace the Cardiac Vascular Nursing Exam 2025 – Pump Up Your Success!

Angiotensin II is a key player in the body's regulation of blood pressure and fluid balance. Its primary role is as a potent vasoconstrictor, which means it constricts blood vessels, leading to an increase in blood pressure. This action is part of the renin-angiotensin-aldosterone system (RAAS), which is activated in response to low blood pressure or low blood volume. When angiotensin II is released, it stimulates blood vessel constriction, thereby increasing peripheral resistance and helping to elevate blood pressure to maintain adequate perfusion to vital organs.

Additionally, angiotensin II promotes the release of aldosterone from the adrenal glands, which leads to increased reabsorption of sodium in the kidneys and, consequently, water retention. This increases blood volume, further contributing to raising blood pressure. Therefore, the role of angiotensin II as a potent vasoconstrictor is central to its function in maintaining cardiovascular stability and responding to physiological stresses.