Across
- 1. protective lining that is sticky
- 5. a cell that fights infections
- 6. alveolus surrounded by a network of_______
- 10. inhale and exhale air through lungs
- 11. an essential component of hemoglobin
- 13. improves eye vision
- 14. toxic soaks the muscles cells
- 15. yellowish liquid component of blood
Down
- 2. stop it from getting crushed
- 3. helps to building amino acids
- 4. strengthen bones and teeth
- 7. a chronic disease
- 8. carries oxygen around the body
- 9. carry out and in air
- 12. tiny hair sweeps out microbes