| A | B |
|---|
| atria | upper chambers of the heart |
| ventricles | lower chambers of the heart |
| aorta | largest artery in the body |
| arteries | carry blood away from the heart |
| veins | carry blood towards the heart |
| capillaries | smallest blood vessels in the body |
| pulmonary circuit | blood flow involving the lungs |
| systemic circuit | blood flow to all the body except the lungs |
