Across
- 3. Tiny hairs
- 5. Thick fluid in sinuses
- 7. Used for breathing
- 10. Let out air
- 11. Element necessary for respiration
Down
- 1. Vessels back to the
- 2. Protects lungs and heart
- 4. Windpipe
- 6. Carries out oxygen to the rest of the body
- 8. Lung with three lobes
- 9. Element of living things