The Respiratory System

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Across
  1. 2. When we breathe,we take in ...
  2. 4. Breathing is the process of taking in ... into our body and giving it out again.
  3. 5. Insect breathe through their ...
  4. 6. The air we breathe out is called ...
  5. 7. Earthwors breathe through their
  6. 8. Fish breathe through their ...
  7. 10. Respiratory is the process in which our cells use oxygen and sugar to produce carbon dioxide,water,and ...
Down
  1. 1. When we breathe out,our ribcage moves ...
  2. 3. The space in our chest to became bigger,when we ...
  3. 9. One of the main organs of the human respiratory system is ...