The Animal Respiratory System

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Across
  1. 2. Tiny muscles that expand and contract airways
  2. 4. Waste gas released during breathing
  3. 6. Sound heard in inflamed lungs that resembles a creaking saddle
  4. 9. Breathing out; air leaves the lungs
  5. 12. Voice box that contains vocal cords
  6. 13. Breathing in; air enters the lungs
  7. 16. Tool used to listen to lung sounds
  8. 18. Exchange of oxygen into blood and carbon dioxide out
  9. 19. Cartilage flap that prevents food from entering the airway
Down
  1. 1. Two large airways that branch off the trachea into each lung
  2. 3. Disease caused by inflamed lungs, often due to infection
  3. 5. Smaller airways that branch off the bronchi
  4. 7. Exchange of gases between the animal and its environment
  5. 8. Common opening used for both breathing and swallowing
  6. 10. Gas that animals breathe in to survive
  7. 11. Muscle under the lungs that helps control breathing
  8. 14. Smallest air sacs where oxygen and carbon dioxide exchange occurs
  9. 15. The rate at which an animal breathes
  10. 17. Air enters through the nose or mouth
  11. 20. Firm windpipe that carries air to the lungs