Question

select the correct answer.
which medicine lowers the heart rate and treats hypertension?
a. ace inhibitors
b. beta - blockers
c. calcium channel blockers
d. antiplatelet agents

Explanation:

Beta - blockers work by blocking the effects of adrenaline on the heart. This leads to a lower heart rate. They also help in treating hypertension by reducing the workload on the heart and relaxing blood vessels.
ACE inhibitors mainly work by blocking the conversion of angiotensin I to angiotensin II, which helps in vasodilation and reducing blood pressure but do not directly lower heart rate in the same prominent way as beta - blockers for this question's context.
Calcium channel blockers work by blocking calcium channels in the heart and blood vessels. They can lower blood pressure by relaxing blood vessels, but their primary effect on heart rate is more variable (some types may have a modest effect on heart rate, but not as a main characteristic as in beta - blockers for this comparison).
Antiplatelet agents are mainly used to prevent blood clotting (by inhibiting platelet aggregation) and are not primarily for lowering heart rate or treating hypertension.

Answer:

B. beta - blockers