JBL EMT Practice Exam

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Which of the following is NOT a characteristic of epinephrine?

  1. Constricts the blood vessels

  2. Decreases heart rate and blood pressure

  3. Dilates passages in the lungs

  4. Secreted naturally by the adrenal glands

The correct answer is: Constricts the blood vessels

Epinephrine, also known as adrenaline, is primarily known for its role in the "fight or flight" response, which increases heart rate and blood pressure. It is secreted naturally by the adrenal glands and also dilates passages in the lungs. The incorrect option, constricting blood vessels, is not a characteristic of epinephrine. In fact, epinephrine actually works to dilate blood vessels in certain areas of the body, such as the muscles, to increase blood flow. Therefore, A is not a characteristic of epinephrine.

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