Across
- 3. To breathe out
- 5. Small blood vessels
- 7. Tubes at the bottom of the trachea where it splits into two
Down
- 1. Other name for the windpipe
- 2. Small air sacks in the lung
- 4. Dome shaped muscle that works with the lungs to help you breathe
- 5. Small hairs that stop dust and mucous from getting into the lungs
- 6. To breathe in