Gas Exchange in Animals

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