Final answer:
Beta blockers cause a dose-related decrease in a person's resting, exercise, and maximal heart rates.
Step-by-step explanation:
The medication that causes a dose-related decrease in a person's resting, exercise, and maximal heart rates is beta blockers. Beta blockers work by blocking the beta-1 receptors, which slows down the heart rate. This makes beta blockers a possible treatment for hypertension, but overprescription of these drugs can lead to bradycardia or even stoppage of the heart.