Across
- 3. Diaphragm relaxes and thoracic cavity shrinks
- 6. Contains C-shape cartilages
- 7. Where gas exchange takes place
- 9. Closes to prevent food and fluid from entering the respiratory tract
- 11. Branches out from the trachea
- 13. Physical movement of air into and out of the respiratory tract
Down
- 1. Control the air distribution in lungs
- 2. Diaphragm contracts and thoracic cavity expands
- 4. Connection between veins and arteries
- 5. Contains the voice box
- 8. Condition due to narrowing of the trachea
- 10. Shared by digestive and respiratory system.
- 12. Reduces surface tension in the alveoli