Respiratory system, Raphael 8B/22

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Across
  1. 6. the voice box
  2. 7. process of taking in oxygen and releasing carbon dioxide
  3. 9. Tiny branches of the bronchi
  4. 10. where gas exchange happens
  5. 11. The windpipe
Down
  1. 1. mechanical process of moving air in and out of the lungs
  2. 2. The tubes that branch off from the trachea
  3. 3. A sticky substance that traps dust and particles
  4. 4. type of gas expelled during exhalation
  5. 5. muscle that buldges upward during exhalation
  6. 8. type of gas received during inhalation