Across
- 1. voice box; contains the vocal cords
- 8. waste product given off in the gas exchange between air and blood in the alveoli.
- 10. the two branches of the trachea
- 12. to breathe in
Down
- 2. group of tiny sacs
- 3. respiratory organ; takes in and releases air
- 4. region behind the nose leading to the throat
- 5. a tube that carries air from the larynx to the lungs
- 6. sheeet of muscle located between the chest and abdomen
- 7. colorless,odorless, tasteless gas that we breathe in
- 9. prevents food from entering the trachea
- 11. to breathe out