Final answer:
Nitroglycerin is used in the treatment of chest pain because it helps to relieve symptoms of angina by improving blood flow to the heart.
Step-by-step explanation:
Nitroglycerin, also known as glyceryl trinitrate, is used in the treatment of chest pain because it helps to relieve symptoms of angina.
Angina is a type of chest pain that occurs when the heart muscle does not receive enough oxygen due to reduced blood flow in the coronary arteries.
Nitroglycerin works by dilating (expanding) the blood vessels, which improves blood flow to the heart and reduces the workload on the heart muscle.