Which statement about angiotensin II is false?

The statement that angiotensin II is reduced in people with diabetes is not accurate. In fact, individuals with diabetes, particularly those with type 2 diabetes, often have elevated levels of angiotensin II. This elevation is due to various factors, including insulin resistance, which can lead to increased production of angiotensinogen and subsequently angiotensin II.

Each of the other statements regarding angiotensin II is true. It plays a significant role in blood pressure regulation by causing vasoconstriction, which increases systemic vascular resistance and, subsequently, blood pressure. Additionally, angiotensin II stimulates the adrenal cortex to release aldosterone, which promotes sodium and water reabsorption in the kidneys, further contributing to blood pressure elevation. The ability of angiotensin II to cause vasoconstriction also directly affects blood vessel diameter, again impacting blood pressure regulation. These physiological effects underscore the importance of angiotensin II in the body’s homeostatic processes related to blood volume and pressure management.