Respiratory problems

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Across
  1. 3. goes in your body
  2. 4. also known as the windpipe
  3. 6. about how many times you breathe a day
  4. 7. something that filters the air
  5. 8. something that carries the blood through your body
Down
  1. 1. the system that I'm doing
  2. 2. what you breathe out
  3. 5. what you breathe in
  4. 9. Something that holds you air after you breathe in