Respiratory System

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Across
  1. 3. tiny sacs and the site of gas exchange
  2. 5. tiny projections on cells that help to move substances
  3. 7. the main organ of the respiratory system
  4. 10. flips to cover the trachea when swallowing food or liquids
  5. 11. located at the back of the nose and mouth
  6. 12. muscle located under the lungs
  7. 13. composed of 20 c-shaped cartilage rings
  8. 14. taking air into the lungs
  9. 15. the structure that protects the lungs and heart
Down
  1. 1. otherwise known as the voice box
  2. 2. movement of substances from high to low concentrations
  3. 4. warms and moistens air (2 words)
  4. 6. letting air out of the lungs
  5. 8. an opening between vocal folds
  6. 9. tubs that lead from the trachea into the lungs