respiratory system
Across
- 2. inflates and deflates lungs
- 4. what we exhale
- 7. small air tubes
- 8. the pipe that sends air to lungs
- 10. what we breath through
- 11. small thin blood vessels that connect the arteries and veins
Down
- 1. process resulting from random motion of molecules
- 3. the organ that collects the air
- 5. what we breath
- 6. air sacs exchange oxygen and carbon dioxide
- 7. at the end of the trachea splits air into each lung
- 9. what aids respiration