New York State Basic Emergency Medical Technician (EMT-B) Practice Exam

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Prepare for the New York State EMT-B Exam. Study using flashcards and multiple-choice questions, with hints and comprehensive explanations for each question. Get ready to ace your exam!

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How does nitroglycerine relieve chest pain according to one theory?

  1. By dehydrating the cardiac muscle

  2. By dilating coronary arteries

  3. By increasing heart rate

  4. By blocking pain receptors in the heart

The correct answer is: By dilating coronary arteries

Nitroglycerin is a medication primarily used to relieve chest pain (angina) associated with heart conditions. One of the theories regarding its mechanism of action is that it dilates the coronary arteries. This dilation improves blood flow to the heart muscle, which is often deprived of oxygen due to narrow or blocked arteries. By increasing the oxygen supply available to the heart, nitroglycerin effectively alleviates the pain associated with angina. The action of dilating coronary arteries not only enhances blood flow but can also reduce the heart's workload by lowering the resistance against which the heart has to pump. This dual effect—improving oxygen supply and reducing demand—works synergistically to relieve the discomfort associated with chest pain.

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