Across
- 3. small hairs in throat
- 4. windpipe
- 6. the liquidy part of blood
- 9. hard bone like material
- 11. very small blood vessels
- 12. air comes in through here
- 13. muscle used for breathing
- 14. air sacs
- 16. voice box
Down
- 1. what we breathe out
- 2. spasm of the diaphragm
- 5. prevents food entering airway
- 7. traps dust in the nose
- 8. tubes from trachea to lungs
- 10. what we breathe in
- 15. main organ