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Angiotensin II not only constricts blood vessels but also contributes to the release of which hormone?

  1. Cortisol

  2. Thyroxine

  3. Aldosterone

  4. Insulin

The correct answer is: Aldosterone

Angiotensin II plays a crucial role in the regulation of blood pressure and fluid balance in the body. One of its significant functions is stimulating the adrenal cortex to release aldosterone, a hormone that is vital for maintaining sodium and potassium levels in the blood. Aldosterone promotes the reabsorption of sodium in the kidneys, which in turn helps to retain water and increase blood volume, thereby raising blood pressure. This process is part of the renin-angiotensin-aldosterone system (RAAS), which is a key regulator of cardiovascular function and fluid balance. Understanding the role of angiotensin II in stimulating aldosterone release is essential when studying the hormonal control of blood pressure and electrolyte balance. In contrast, the other hormones listed in the choices do not have a direct relationship with angiotensin II in this context.