What is the mechanism of action for ACE inhibitors?

What is the mechanism of action for ACE inhibitors?

• A. They block the action of angiotensin II at its receptor
• B. They prevent the conversion of angiotensin I to angiotensin II, leading to vasodilation and reduced blood pressure
• C. They increase the reabsorption of sodium in the kidneys
• D. They stimulate the adrenal gland to release aldosterone

Answer: (B)

The mechanism of action of ACE inhibitors is accurately identified as preventing the conversion of angiotensin I to angiotensin II. Angiotensin II is a potent vasoconstrictor that contributes significantly to increased blood pressure. By inhibiting the angiotensin-converting enzyme (ACE), these medications reduce the levels of angiotensin II, leading to vasodilation – the widening of blood vessels. This effect not only lowers blood pressure but also decreases the workload on the heart and improves blood flow. Furthermore, this reduction in angiotensin II also leads to decreased secretion of aldosterone from the adrenal glands, which contributes to sodium and water retention. Thus, ACE inhibitors play a critical role in managing conditions such as hypertension and heart failure by promoting vasodilation, reducing blood volume, and ultimately decreasing blood pressure.

The mechanism of action of ACE inhibitors is accurately identified as preventing the conversion of angiotensin I to angiotensin II. Angiotensin II is a potent vasoconstrictor that contributes significantly to increased blood pressure. By inhibiting the angiotensin-converting enzyme (ACE), these medications reduce the levels of angiotensin II, leading to vasodilation – the widening of blood vessels. This effect not only lowers blood pressure but also decreases the workload on the heart and improves blood flow.

Furthermore, this reduction in angiotensin II also leads to decreased secretion of aldosterone from the adrenal glands, which contributes to sodium and water retention. Thus, ACE inhibitors play a critical role in managing conditions such as hypertension and heart failure by promoting vasodilation, reducing blood volume, and ultimately decreasing blood pressure.