heart anatomy

heart anatomy human blood aorta atrium circulatory atrioventricular medicine elements disease cardiac atria ventricles myocardium endocardium epicardium septum valves coronary arteries pulmonary artery vena cava mitral valve tricuspid aortic sinoatrial node vector medical diagram system circulation science ventricle biology body organ health drawing pulse cardiovascular cardiology vein flow right left cross muscle care healthcare heartbeat healthy anatomical labeled vessels education pump parts internal