Which of the following medications usually end in '-pril' and are used to relax the blood vessels?

Beta blockers, including medications like metoprolol and atenolol, do not end in '-pril' and primarily work by blocking the effects of adrenaline on beta-adrenergic receptors. This action reduces heart rate and cardiac output but does not directly cause relaxation of blood vessels; hence they are not classified under the same category as ACE inhibitors.

Calcium channel blockers, such as amlodipine and diltiazem, also do not end in '-pril'. They function by preventing calcium from entering the cells of the heart and blood vessel walls, leading to relaxation of the blood vessels. While they are effective in managing hypertension, they belong to a different class of medications compared to ACE inhibitors.

Statins, such as atorvastatin and simvastatin, are cholesterol-lowering medications that do not end in '-pril'. They primarily work by inhibiting HMG-CoA reductase, which is involved in cholesterol synthesis in the liver. Statins do not directly affect blood vessel relaxation, thus differentiating their mechanism and purpose from ACE inhibitors.