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