Aldosterone

Aldosterone, an adrenal steroid hormone, derived from cholesterol. It is secreted by the adrenal cortex and acts on the distal tubules of the kidney to control the elimination of salts and water by the kidneys. The presence of the pituitary hormone ACTH, changing levels of sodium and potassium. And variations in blood volume stimulate the production of aldosterone by the cortex.

Aldosterone is a component of the rennin- angiotensin-aldosterone system (RAAS).  A com­plex feedback system that functions in homeostasis.