Across
- 3. tiny hair-like structures in bronchi to push foreign matter up to throat
- 4. throat, at back of mouth and nose, connects to oesophagus and trachea
- 8. respiratory organ of many arachnids (e.g. spider)
- 9. flap which closes when swallowing to block airway
- 12. cartilaginous air tube from mouth to bronchi (aka "windpipe")
- 13. respiratory organ of terrestrial vertebrates
- 14. breathing movements
Down
- 1. wetting agent produced in alveoli to help keep them open
- 2. respiratory organs in many aquatic animals (e.g. fish)
- 5. tiny air sacs in lungs where gas exchange occurs
- 6. sticky substance secreted by glands in airway to trap foreign material
- 7. respiratory openings along the thorax and abdomen of insects (e.g. grasshoppers)
- 10. voice box
- 11. branched passageways from trachea to lungs