Respiratory System

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Across
  1. 2. when we take out carbondioxide
  2. 3. Small air pockets or sacs.
  3. 5. Sheet of muscles
  4. 6. when we take oxygen in
  5. 8. Trachea divided into two branches
Down
  1. 1. Gas we take out
  2. 4. Wind pipe is also called
  3. 7. Two spongy organs
  4. 9. Gas we take in