Respiratory System

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Across
  1. 5. Flow of air through a bird's respiratory system
  2. 8. Result of anaerobic respiration
  3. 10. Without oxygen
  4. 12. Breathing in
  5. 15. Used for vocalisation in birds
  6. 16. Pockets with rich blood supply and thin walls
Down
  1. 1. ATP
  2. 2. Breathing out
  3. 3. Release of energy
  4. 4. With oxygen
  5. 6. Oxygen carrying protein in muscles
  6. 7. Flow of air through a mammal's respiratory system
  7. 9. Birds do not have this
  8. 11. Branches of the trachea, one to each lung
  9. 13. Used for vocalisation in mammals
  10. 14. Birds nostrils