ACE (Angiotensin-Converting Enzyme): ACE is a key enzyme in the Renin-Angiotensin System (RAS) that plays an essential role in regulating blood pressure and fluid balance. It catalyses the conversion of angiotensin I to angiotensin II, a powerful vasoconstrictor. This process helps control vascular tone, electrolyte balance, and blood pressure. In addition to its role in narrowing blood vessels and stimulating aldosterone release, ACE is involved in heart function, kidney health, and inflammatory responses. Dysregulation of ACE activity is linked to conditions such as hypertension, heart failure, and kidney disease.