heart, human, model, muscle, failure, cardiac, anatomy, stroke, education, health, medical, blue, student, red, medicine, science, person, healthy, life, body, care, blood, illness, biology, pain, pandemic, clinic, surgery, system, cardiology, organ, injury, pulse, atrium, physiology, cardiovascular, chest, aorta, emergency, coronary, artificial, demonstrate, demonstration, internal, heart attack, attack, bypass, heart surgery, showing, open