Angiotensin II

Angiotensin II is a hormone in the body that plays a key role in regulating blood pressure and fluid balance. When blood pressure drops or there's low salt in the blood, the kidneys release signals to produce angiotensin II. This hormone causes blood vessels to tighten, which raises blood pressure, and also signals the kidneys to retain water and salt, increasing blood volume. Together, these effects help restore normal blood pressure and fluid levels, ensuring the body functions properly.