| Flap 1 | Flap 2 |
| tube that air travels through to get to the lungs | trachea |
| the trachea breaks into two smaller tubes called | bronchi |
| the bronchi lead to small air sacks called | alveoli |
| What surrounds the alveoli so it can take the oxygen from the alveoli to the heart? | capillaries |
| What do the capillaries drop off in the alveoli so it can be breathed out of the body? | carbon dioxide |
| Where do the capillaries send the oxygen rich blood? | heart |
| Where does the heart send the oxygen rich blood? | body |
| Which blood vessels carry oxygen rich blood away from the heart? | arteries |
| Which blood vessels carry oxygen poor blood back to the lungs to be breathed out? | veins |
