Across
- 5. We breathe in using a muscle called the?
- 6. the tiny air sacs at the ends of the bronchi
- 8. one thing our nose helps to filter
- 9. what do we breathe in?
Down
- 1. what is the name of the system humans use to breathe?
- 2. we couldn't talk without it.
- 3. carbon dioxide is the name of the waste...?
- 4. what is bad for your lungs?
- 7. the colour of a healthy lung