Respiratory System

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Across
  1. 4. connects the windpipe to the lungs
  2. 5. located in lungs where blood turns oxygen to carbon dioxide
  3. 7. where the breathing starts
  4. 8. main system used for breathing
Down
  1. 1. also called a windpipe
  2. 2. breathing tube under the nose
  3. 3. an organ which pulls in air into the lungs
  4. 6. where the heart resides