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heart surreal leaves branches pink blue blood veins arteries chambers valves septa pericardium myocardium endocardium atria ventricles aorta pulmonary artery pulmonary veins superior vena cava inferior vena cava coronary arteries thebesian veins heart valves septum pericardium myocardium endocardium atria ventricles aorta pulmonary artery pulmonary veins superior vena cava inferior vena cava coronary arteries thebesian veins heart valves