Which hormone is responsible for regulating blood pressure?

Aldosterone plays a crucial role in regulating blood pressure by managing sodium and water balance in the body. It is a steroid hormone produced by the adrenal glands and acts primarily on the kidney, promoting the reabsorption of sodium and the excretion of potassium. When sodium is retained, water follows, which increases blood volume and consequently raises blood pressure.

The regulation of blood pressure is vital for maintaining homeostasis, and aldosterone's influence on fluid balance directly impacts blood pressure levels. Enhanced aldosterone secretion can lead to hypertension due to increased blood volume.

In contrast, while hormones like thyroxine, insulin, and adrenaline can influence various physiological processes, their primary roles do not center specifically on blood pressure regulation in the same direct manner as aldosterone does.