| A | B |
|---|
| superior vena cava | brings blood to heart from brain |
| inferior vena cava | brings blood to heart from lower body |
| sinoatrial node | pacemaker |
| intraventricular septum | divides the heart longitudinally |
| aorta | largest artery in the body |
| pulmonary arteries | only arteries in the body with deoxygenated blood |
| pulmonary veins | only veins in the body with oxygenated blood |
| tricuspid valve | valve between the right atrium and right ventricle |
| mitral valve | valve between the left atrium and left ventricle, i.e. bicuspid |
| atria | receiving chambers |
| ventricles | pumping chambers |
| left ventricle | strongest chamber in the heart |
| pericardium | membrane surrounding the heart |
| four | chambers in the mammalian heart |
| three | chambers in the amphibian heart |
 | chordae tendineae |
 | mitral valve |
 | papillary muscle |
 | intraventricular septum |
| 1967 | year of first heart transplant |
| fibrillation | rapid uncoordinated shuddering of the heart muscle |
 | SA Node |
 | AV Node |
 | Bundle of His |
 | Bundle Branches |
 | Purkinje Fibers |
