| A | B |
|---|
| oxygen | a gas that the cells need to do respiration |
| blood | the liquid that transports materials |
| heart | pumps blood through the body |
| nutrients | the small molecules that originally came from food |
| capillaries | tiny blood vessels connecting arteries to veins |
| waste products | carbon dioxide and water that the cells don't need |
| artery | moves blood from the heart out to the body |
| vein | moves blood from the body back to the heart |
| blood vessel | anything that blood can travel through |
| circulation | The transport of materials in living things |
