Emergency Medical Technician (EMT) Practice Test

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Prepare for the EMT Test with multiple-choice questions and explanations. Study with flashcards and access detailed resources to enhance your knowledge. Get set for a successful exam experience!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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What does nitroglycerin do?

Increases heart rate
Constricts blood vessels
Dilates vessels to reduce heart's preload
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.