Across
- 2. allows air to pass
- 7. digestion begins
- 12. A large tube
- 13. fights disease
- 14. tiny sacs of lung tissue
- 15. A group of similar cells
Down
- 1. Found in the kidney
- 3. carries oxygen from the lungs
- 4. carries blood away from the heart
- 5. group of organs
- 6. Airways in the lungs
- 8. upper chamber heart
- 9. large muscular sac
- 10. plays an important part in forming scabs
- 11. carries blood to the heart