The Respiratory System

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Across
  1. 2. also called a windpipe
  2. 3. we breathe this in
  3. 4. it moves up and down as we breathe
  4. 6. where oxygen and carbon dioxide is changed over
  5. 8. these protect the lungs
Down
  1. 1. we breathe this out
  2. 5. the bramches that are joined to the trachea
  3. 7. the organ we breathe with