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aorta arteries arterioles artery atria atrioventricular atrium bicuspid blood capillaries chambers cycle deoxygenated ecg ekg electrical electrocardiogram endocardium epicardium heart impulse interval lungs myocardium node organ oxygenated oxygenrich pqrst pulmonary pulse pump signal signals sinoatrial tissue tricuspid upper valve veins ventricle ventricles venules