left coronary artery great cardiac vein right coronary artery circumflex branch coronary sinus middle cardiac vein 5% of systemic circulation is blood flowing through the coronary circulation. The branches into the anterior interventricular branch (which supplies both ventricles and the anterior 2/3 of the interventricular septum), and the , which supplies the left atrium and posterior wall of the left ventricle. The supplies the right atrium and sinoatrial node. Blood is returned to the right atrium through a series of cardiac veins. The collects blood from the anterior portion of the heart and empties into the coronary sinus. The collects blood from the posterior portion of the heart and drains into the

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