Across
- 1. surround the alveoli
- 2. exhalation is a ____ process
- 4. prevents food entering the trachea
- 6. located in the throat
- 8. involuntary muscle at base of thorax
- 9. inhalation is a ___ process
- 10. breathing in
- 13. helps to give tubes strength
- 14. function is gas exchange
Down
- 1. particles move from an area of high ___ to low ___
- 3. type of muscle that forms the walls of the thorax along with the ribs
- 5. located in the voice box
- 7. the process by which gas exchange takes place
- 9. breathing disorder
- 11. first tube air travels through
- 12. contains hairs and mucus to filter air
- 13. tiny hairs that defend lungs from infection