Emergency Medical Technician (EMT) Practice Test

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Prepare for your EMT Test with flashcards and practice questions. Each question includes explanations. Test your knowledge and get ready for your EMT exam!

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What does nitroglycerin do?

  1. Increases heart rate

  2. Constricts blood vessels

  3. Dilates vessels to reduce heart's preload

  4. Decreases oxygen supply to the heart

The correct answer is: Dilates vessels to reduce heart's preload

Nitroglycerin primarily acts by dilating blood vessels, specifically veins, which can reduce the workload on the heart. This in turn decreases the heart's preload and oxygen demand, making it an effective treatment for angina or chest pain. Option A is incorrect because nitroglycerin does not directly affect heart rate. Option B is also incorrect as it is the opposite effect of what nitroglycerin does. Option D is incorrect as it does not decrease oxygen supply to the heart, but rather helps to improve oxygen supply by reducing the heart's workload.

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