Across
- 3. Main pathway of air through the lungs
- 4. Muscle responsible for inspiration and expiration
- 5. Smallest functional unit of the respiratory system
- 7. Oxygenated air from the environment enters the?
- 8. Contains the Epiglottis
Down
- 1. Known as the windpipe
- 2. The bronchi branch into finer tubes called?
- 6. Contains the voicebox