The release of aldosterone is primarily stimulated by: 1. Angiotensin II: This peptide hormone is part of the RAAS and is a potent stimulator of aldosterone secretion. 2. High Potassium Levels: Elevated potassium levels in the blood can directly stimulate the adrenal cortex to release aldosterone. 3. Adrenocorticotropic Hormone (ACTH): Although less influential, ACTH can also stimulate the production of aldosterone.