Which of the following is a function of angiotensin II?

Angiotensin II plays a crucial role in the body’s regulation of blood pressure and fluid balance. One of its primary functions is to stimulate the adrenal cortex to increase the secretion of aldosterone, a hormone that promotes sodium and water retention in the kidneys. This retention leads to an increase in blood volume, which in turn raises blood pressure.

Understanding the physiology behind this action is essential. Aldosterone secretion is part of the renin-angiotensin-aldosterone system (RAAS), which is activated in response to low blood pressure, low blood volume, or low sodium levels. When angiotensin II levels rise, it signals the adrenal glands to release aldosterone, making its role vital for maintaining blood pressure homeostasis.

The other options do not align with the primary actions of angiotensin II. The hormone does not decrease blood pressure; rather, it typically increases it. It also does not reduce sympathetic activity since it can enhance sympathetic responses, contributing further to blood pressure regulation. Additionally, angiotensin II promotes the release of renin, rather than inhibiting it, as it is part of the feedback mechanism that cannot solely rely on the inhibition of renin for its action. Therefore, the selection of increased aldosterone secretion accurately