Across
- 3. Protects the lungs from mechanical injuries
- 5. breakdown of glucose in the presence of oxygen
- 6. Guard of entrance to trachea
- 7. Air breathed in and out in a normal quiet breathing
- 8. An inverted Y-shaped tube
- 9. respiratory pigment rich in iron
Down
- 1. facilitates the downward and upward rib movement causing the enlargement of the chest cavity all around.
- 2. Helps to increase the volume of the chest activity lengthwise
- 4. Volume of air that can be inhaled and exhaled by maximum inspiration and expiration respectively
- 7. the air tubes of insects