CVS Practice Test 2025 – Complete Exam Preparation

The percentage of cardiac output that passes through the coronary circulation is approximately 5%. This figure is significant because it highlights how a relatively small fraction of the total blood flow is dedicated to nourishing the heart muscle itself. The coronary arteries provide oxygen-rich blood to the myocardium, which is essential for the heart's functioning and its ability to pump effectively.

Understanding that only about 5% of the cardiac output goes to coronary circulation is crucial for comprehending various cardiovascular conditions. For instance, if there is any obstruction in the coronary arteries, it can lead to ischemia (insufficient blood supply) of the heart muscle, even though the heart itself is responsible for pumping the majority of the blood to the rest of the body. Additionally, knowledge of coronary circulation is vital for assessing the effectiveness of treatments aimed at restoring blood flow or for planning interventions like angioplasty or coronary artery bypass grafting.

The other options are either underestimations or overestimations of the blood flow through the coronary circulation. Recognizing the correct percentage helps in understanding the heart's physiology and the importance of coronary health.