respiratory system

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Across
  1. 3. this helps u take in air
  2. 5. air go in this pipe and it filters it
  3. 6. this is a curved organ which extracts
  4. 7. it is a small air sac which gives oxygen to the pulmonary atery and gives out carbon dioxide
Down
  1. 1. this part is a pipe which lets air go into the lungs
  2. 2. these are tiny hair which collect dust particles
  3. 4. this part helps u breathe