RECAP-RESPIRATORY SYSTEM

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Across
  1. 4. exchange center of gases
  2. 6. gas we breathe in
  3. 8. dioxide gas we breathe out
Down
  1. 1. trachea divides into two___________
  2. 2. air enters our body through___________
  3. 3. the other name of windpipe___________
  4. 5. when we exhale, our lungs__________
  5. 7. when we inhale, our lungs__________
  6. 9. it carries oxygen to different cells of the body