CVS Practice Test

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The left circumflex artery supplies blood to the SA node in what percentage of the population?

  1. 10%

  2. 25%

  3. 45%

  4. 60%

The correct answer is: 45%

The left circumflex artery is responsible for supplying blood to the sinoatrial (SA) node in a significant portion of the population. Specifically, research indicates that approximately 45% of individuals have their SA node supplied by the left circumflex artery. This value is important for understanding the variations in coronary circulation and the implications for arrhythmias and other heart conditions. In contrast, the remaining percentage of the population is supplied by different arteries, primarily the right coronary artery. Thus, knowing that almost half of the population relies on the left circumflex artery for SA node blood supply helps to comprehend cardiac anatomy and its clinical significance, especially in the context of ischemic heart disease and possible implications during surgical procedures. Understanding the distribution of blood supply to the heart is critical for diagnosing and managing cardiovascular conditions effectively.

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