JBL EMT Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the JBL EMT Exam and improve your chances of success. Study with our flashcards, multiple-choice questions, hints, and explanations. Get exam-ready!

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!

Practice this question and more.

When the myocardium requires more oxygen:

the arteries supplying the heart dilate
the AV node conducts fewer impulses
the heart contracts with less force
the heart rate decreases significantly

The correct answer is: the arteries supplying the heart dilate

When the myocardium, the muscular tissue of the heart, needs more oxygen, the body will deliver it by dilating the arteries that supply the heart. This allows for more blood flow and oxygen to reach the myocardium. This is the body's way of increasing oxygen supply to meet the increased demand of the heart. Options B, C, and D are incorrect because they do not address the issue of oxygen supply to the myocardium. The AV node conducts electrical impulses in the heart, but it does not affect oxygen supply. The strength of heart contractions and heart rate also do not directly impact oxygen supply, although they may indirectly affect it in certain situations. Therefore, only option A is the correct and logical choice.