Across
- 3. a cell that fights infections
- 5. network surrounds the alveolus
- 9. helps building amino acids
- 10. protective lining that is sticky
- 11. carry out and in air
- 13. strengthen bones and teeth
- 14. break down carbohydrates for energy
Down
- 1. carries oxygen around the body
- 2. inhale and exhale air through lungs
- 4. improves eye vision
- 6. essential component of haemoglobin
- 7. a respiratory chronic disease
- 8. yellowish liquid component of blood
- 9. slippery membrane surrounding the lungs
- 12. tiny hair sweeps out microbes