ACE (Angiotensin-Converting Enzyme): ACE is a key enzyme in the Renin-Angiotensin System (RAS) that helps regulate blood pressure and fluid balance. It converts angiotensin I into angiotensin II, a potent vasoconstrictor that influences blood vessel tone, electrolyte levels, and stimulates the release of aldosterone. ACE also plays important roles in heart function, kidney health, and inflammatory processes. Imbalances in ACE activity are associated with conditions such as hypertension, heart failure, and kidney disease.