amphibian animal kingdom annelid anterior interventricular sulcus aorta aortic sinus apex of the heart arteriole artery arthropod automated external defibrillator base of the heart bird blood blood vessel brain bundle of his capillary cardiac arrest cardiac cycle cardiac muscle cardiac pacemaker cardiac skeleton cardiology cardiopulmonary resuscitation cattle cephalopod chicken chyle circulatory system conus arteriosus crista terminalis critical cusps of heart valves defibrillation dense connective tissue dextrocardia diaphragmatic surface of heart double circulatory system electrical conduction system of the heart electrocardiogram endocardium endothelium england and wales fibrous pericardium fibrous rings of heart fibrous trigone fish fowl galen gas exchange gastrulation gill gram greek language heart chamber heart development heart disease heart valve hippocrates human anatomy human lung interatrial groove involuntary muscle left atrial appendage left atrium left heart left margin of heart left ventricle limbus of fossa ovalis liver lung mammal mediastinum mesoderm mesothelium mitral valve muscle musculi pectinati neural plate offal pericardial cavity pericardial sinus pericardium pig pool posterior interventricular sulcus pulmonary artery pulmonary circulation purkinje fibers reptile right atrial appendage right atrium right border of heart right heart right ventricle serous pericardium sternocostal surface stethoscope syncytium systemic circulation thorax torso trabeculae carneae tricuspid valve tunica intima tunica media valve of the coronary sinus valve of the inferior vena cava vasa vasorum vein venison venule vertebrate wikimedia commons wiktionary