Across
- 2. also called a windpipe
- 3. we breathe this in
- 4. it moves up and down as we breathe
- 6. where oxygen and carbon dioxide is changed over
- 8. these protect the lungs
Down
- 1. we breathe this out
- 5. the bramches that are joined to the trachea
- 7. the organ we breathe with