Across
- 3. throat region that serves as a passageway
- 4. network of airways within the lungs
- 7. tiny air sac in lungs
- 12. pressure exerted by gas mixture
- 14. the windpipe
- 15. two main branches that divide
- 16. substance secreted by cells
Down
- 1. specialized areas in the brainstem
- 2. narrow branch of bronchial tree
- 4. larger airways that branch off
- 5. the space within the nose that filters the air
- 6. voice box
- 8. barrier between alveoli and capillaries
- 9. large spongy organs
- 10. maximum amount of air that can be exhaled
- 11. cluster of tiny air sacs
- 13. responsible for intake of oxygen