Across
- 2. Muscle under lungs, aids breathing
- 4. Waste gas from human respiration
- 7. Small air tubes in lungs
- 8. Air tube in the throat
- 10. Breathing and smelling organ on face
- 11. Small blood vessels in body
Down
- 1. Particles spreading naturally
- 3. Organs for breathing, oxygen exchange
- 5. Gas essential for human respiration
- 6. Tiny air sacs in lungs
- 7. Air tubes in the lungs
- 9. Bony cage protecting chest organs