Final answer:
Aldosterone secretion is regulated by the presence of Angiotensin II in the circulation. Angiotensin II is a hormone that is released in response to low blood pressure or low blood volume.
Step-by-step explanation:
Aldosterone secretion is regulated by the presence of Angiotensin II in the circulation. Angiotensin II is a hormone that is released in response to low blood pressure or low blood volume. It stimulates the release of aldosterone from the adrenal cortex, which promotes sodium reabsorption and water retention in the kidneys.