Across
- 3. Waste Product
- 4. Connects nose and mouth to the oesophagus
- 8. Tiny Air sacs
- 9. Movement of air in and out of lungs
- 10. Secondary external opening
- 12. Providing oxygen for respiration
- 13. Main organ of respiratory system
Down
- 1. Mouth
- 2. Lungs are filled with _________ of tubes
- 5. Larynx
- 6. Diaphragm moves down
- 7. Filter's air
- 11. In gas exchange oxygen ________ into blood