The heart requires its own blood supply, stemming from the aorta is the coronary artery which splits into left and right. The right coronary artery on the right side of the heart. The marginal artery branches off and supplies the right atrium with blood. Continuing along to the posterior of the heart. The posterior interventricular artery supplies the ventricles with blood. The left coronary artery is on the left side of the heart. The circumflex artery branches off and wraps around to the posterior of the heart, supplying the left atrium with blood. The anterior interventricular artery, which is branched off the left coronary artery goes down the anterior side of the heart supplying the atrium and left ventricle with blood. All the deoxygenated blood is then drained by the cardiac vein. From the cardiac vein the blood goes into the coronary sinus. From the coronary sinus the blood goes into the right atrium.
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