HUMAN RESPIRATORY SYSTEM
Across
- 4. common passage for food and air
- 7. pair of spongy organs
- 9. prevents the food from entering windpipe.
- 10. protected by the ribcage
Down
- 1. two tubes leading in the lungs
- 2. breathing without oxygen
- 3. helps in the movement of rib cage
- 5. air rushes out of the nose
- 6. diaphragm is pulled downwards
- 8. keeps the airway clean