Respiratory System

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Across
  1. 2. tiny blood vessels around alveoli where gas exchange occurs
  2. 4. the voice box that produces sound
  3. 5. the protective membrane surrounding the lungs
  4. 6. the muscle that helps move air in and out of the lungs
  5. 8. dioxide, the waste gas produced by cells and expelled from the body
  6. 9. a sticky substance that traps dust and germs in the respiratory system
  7. 10. the main organs where gas exchange occurs
  8. 13. the process of pushing air out of the lungs
  9. 15. tiny air sacs in the lungs where oxygen enters the blood
  10. 17. two large tubes that branch from the trachea into each lung
  11. 18. the windpipe that carries air to the lungs
  12. 19. tiny hair-like structures that move mucus out of the lungs
Down
  1. 1. the overall process of breathing and gas exchange
  2. 3. the process of taking air into the lungs
  3. 7. smaller branches of the bronchi inside the lungs
  4. 9. an alternative opening for air to enter the body
  5. 11. the main external opening for air to enter the respiratory system
  6. 12. the throat that connects the nose and mouth to the larynx and esophagus
  7. 14. the gas needed by cells for energy
  8. 16. a flap that prevents food from entering the trachea