Final answer:
The calcium channel blocker in the provided list is diltiazem. It is part of a class of drugs that relax blood vessels and reduce heart workload by blocking calcium entry into muscle cells of the heart and blood vessels.
Step-by-step explanation:
The calcium channel blocker among the options provided is diltiazem. Calcium channel blockers, also known as calcium antagonists or calcium blockers, are a class of medications used to treat various cardiovascular conditions, such as hypertension, angina, and some arrhythmias. They work by inhibiting the flow of calcium into the muscle cells of the heart and blood vessels, which relaxes the vessels and decreases the heart's workload.
Diltiazem is listed under the examples of calcium channel blockers like Amlodipine, Felodipine, Verapamil, and others. It is important not to confuse calcium channel blockers with other classes of antihypertensive drugs like angiotensin II receptor blockers (ARBs) such as Candesartan, or ACE inhibitors such as Lisinopril, which have different mechanisms of action.