The nurse is reviewing the anatomy of the heart with a patient scheduled for a cardiac catheterization. What should the nurse explain as the primary factor that regulates blood flow through the coronary arteries?
1. blood pressure in the aorta
2. blood vessel dilation
3. low-pressure systemic circulation
4. draining of blood into the coronary sinus by the coronary veins
Correct Answer: 1
Blood flow through the coronary arteries is primarily regulated by the aortic blood pressure. Blood vessel dilation is a secondary factor that regulates blood flow through the coronary arteries. The systemic circulation is a high-pressure circulation system. Draining of blood into the coronary sinus by the coronary veins does not regulate blood flow through the coronary arteries.
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