| A | B |
|---|
| lungs | replaces carbon dioxide in blood with oxygen |
| pulmonary vein | blood vessel that carries oxygen-rich blood to the heart |
| left atrium | chamber that receives oxygen-rich blood in the heart |
| left ventricle | chamber that pumps oxygen-rich blood out of the heart |
| aorta | the body's biggest artery |
| artery | distributes blood from the heart to smaller blood vessels |
| capillaries | carry blood to and from body cells |
| veins | receive low-oxygen blood from small blood vessels |
| right atrium | chamber that receives low-oxygen blood in the heart |
| right ventricle | chamber that pumps low-oxygen, high-carbon-dioxide blood out of the heart back to the lungs |
