ACE (Angiotensin-Converting Enzyme): ACE is a key enzyme in the Renin-Angiotensin System (RAS) that plays a crucial role in regulating blood pressure and fluid balance. It catalyses the conversion of angiotensin I to angiotensin II, a potent vasoconstrictor. This process helps control vascular tone, electrolyte balance, and blood pressure. Besides its function in constricting blood vessels and stimulating aldosterone release, ACE is involved in heart function, kidney health, and inflammatory responses. Dysregulation of ACE activity is associated with conditions like hypertension, heart failure, and kidney disease.