| A | B |
|---|
| Ventricles | the lower chamber of the heart |
| Atria | The upper chamber of the heart |
| Endocardium | innermost layer of the heart |
| Myocardium | the middle muscular layer of the heart |
| pericardium | the outer sac-like covering of the heart |
| Endocarditis | Inflammation of the innermost layer of the heart |
| Thrombosis | blood clot |
| Myocarditis | Inflammation of the middle muscular layer of the heart |
| Mitral Valve Prolapse | when the flaps of the mitral valve extend back into the left atrium, causing incompetent valves. |
| Incompetent Valve | Allow some blood to flow back into the chamber from which it came. |
