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aorta arteries arterioles artery atria atrioventricular atrium bicuspid blood called capillaries chambers comprise cycle deoxygenated depolarization ecg ekg electrical electrocardiogram endocardium epicardium heart impulse interval lungs myocardium node organ oxygenated oxygenrich pqrst pulmonary pulse pump recorded repolarization represent right sequence signal signals sinoatrial tissue tracing tricuspid typical upper valve veins ventricle ventricles venules wave waves