anatomy, artery, atrium, biology, blood, body, cardiology, chest, drawing, electrocardiogram, health, healthcare, healthy, heart, heartbeat, cow, beef, cattle, hospital, animal, internal, life, medical, muscle, patient, physical, pulse, pump, rate, science, sick, stress, symbol, system, teach, test, tissue, trunk, vein, vena, ventricle, atrioventricular valves, bicuspi valve, tricuspid valve, anatomical, medicine