| A | B |
|---|
| Heart | Muscular organ that pumps blood |
| Mediastinum | Space between lungs where heart is located |
| Endocardium | Inner lining of heart wall |
| Myocardium | Muscular layer of heart wall |
| Pericardium | Membrane that surrounds and protects the heart |
| Fibrous Pericardium | Tough outer layer of the pericardium that anchors the heart and prevents overfilling |
| Serous Pericardium | Double-folded layer of the pericardium |
| Parietal pericardium | Part of the serous pericardium that lines the inside of the fibrous pericardium (wall) |
| Visceral pericardium | Part of the serous pericardium that lines the outside of the heart muscle |
| Coronary Arteries | Supply blood to heart muscle |
| Septum | Wall dividing right and left sides of heart |
| Atrium | Upper chamber receiving blood |
| Ventricle | Lower chamber pumping blood |
| Tricuspid Valve | Valve between right atrium and ventricle |
| Pulmonary Valve | Valve between right ventricle and pulmonary artery |
| Bicuspid Valve | Valve between left atrium and ventricle |
| Aortic Valve | Valve between left ventricle and aorta |
| Diastole | Phase of heart between contractions of the ventricules (relaxation) |
| Systole | Phase of heart when the ventricles contract |
| Sinoatrial Node | Natural pacemaker of heart |
| Atrioventricular Node | Delays signal between atria and ventricles |
| His-Purkinje System | Conducts impulses through ventricles |
| Pulse | Pressure wave felt in arteries when ventricles contract |
| Blood Pressure | Force exerted by blood against artery walls |
| Cardiologist | Physician specializing in diagnosing and treating disorders of the cardiovascular system |
