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3D rendering heart human heart anatomy medical science biology health cardiology blood vessels chambers atria ventricles valves aorta vena cava pulmonary artery pulmonary vein superior vena cava inferior vena cava left atrium right atrium left ventricle right ventricle septum pericardium myocardium endocardium heart rate blood pressure electrocardiogram echocardiogram cardiac arrest heart attack stroke heart failure congenital heart defects heart transplant artificial heart heart disease heart health heart surgery