Home › MCQs › MBBS › Question #10190
Back to Questions
MBBS QUESTION #10190
Question 1
The sinoatrial (SA) node's blood supply, and in most individuals the atrioventricular (AV) node's blood supply as well, arise from which coronary artery?
  • Left circumflex artery in all individuals
  • Right coronary artery (right-dominant circulation, the majority pattern)✔️
  • Left anterior descending artery
  • Left main coronary artery
Correct Answer Explanation
In the majority (right-dominant) pattern, the right coronary artery gives rise to the SA nodal artery and, via the posterior descending/AV nodal branch, supplies the AV node — explaining why inferior wall myocardial infarctions (right coronary territory) are commonly complicated by bradyarrhythmias and heart block.