You are caring for a patient with chest pain who has just taken his nitroglycerin. The patient's chest pain has been alleviated. You understand that nitroglycerin is effective in treating chest pain because it:
a. increases the heart rate and gets more blood to the heart muscle.
b. has a sedative effect, which makes the patient less aware of the pain.
c. dilates the arteries and veins, which decreases the workload on the heart.
d. causes the body to relax, decreasing the need for oxygen.
Answer: c
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