OPSA Essentials Practice Test

Beta-blockers block beta-adrenergic receptors, which slows the heart rate, reduces contractility, and lowers the heart’s workload. Metoprolol is a selective beta-1 blocker, so it directly fits this class. Lisinopril is an ACE inhibitor, lowering blood pressure by reducing angiotensin II. Amlodipine is a calcium channel blocker that decreases calcium entry into smooth muscle and cardiac cells. Furosemide is a loop diuretic that promotes diuresis by inhibiting NKCC2 in the kidney. Metoprolol is the beta-blocker.