Respiratory System

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Across
  1. 3. gas that diffuses into blood
  2. 5. voice box
  3. 7. muscle that contracts when we inhale
  4. 9. breathing tube
  5. 11. to breathe in
  6. 12. smaller tubes that lead to alveoli
Down
  1. 1. back of throat
  2. 2. blood vessels that surround the alveoli
  3. 4. two tubes that split off the trachea
  4. 6. moisten and warm the breath
  5. 8. small sacs that inflate when we inhale
  6. 10. to breathe out