Which of the following is a common effect of calcium channel blockers on arteries?

Calcium channel blockers are medications primarily used to treat conditions such as hypertension and angina. They work by inhibiting the influx of calcium ions into the muscle cells of the heart and the blood vessels. This results in the relaxation of smooth muscle surrounding the arteries, leading to a dilation of blood vessels.

When the arteries dilate, it reduces vascular resistance, which can lower blood pressure and improve blood flow, making it easier for the heart to pump blood. This dilatory effect is particularly beneficial in managing angina, as it helps to increase blood flow to the heart muscle itself.

In contrast, constriction of blood vessels is not associated with calcium channel blockers; rather, these medications work against such constriction. Elevation of cardiac contractility and increased heart rate would typically be effects associated with other classes of drugs, such as stimulants or certain catecholamines, rather than calcium channel blockers. These drugs generally lead to a decrease in heart rate, which is another mechanism by which they help manage hypertension.