The Human Respiratory Systems

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Across
  1. 4. the __________ that is breathe out is called exhaled air.
  2. 6. Air contain oxygen, carbon dioxide, nitrogen and water __________.
  3. 7. Plants, fish and human take in __________ and give out carbon dioxide differently.
  4. 9. Air is made up of ____________.
  5. 10. The respiratory system includes the nose, _________ and lungs.
Down
  1. 1. The tiny openings on the leaves allow for gaseous ____________.
  2. 2. The air that we breathe in is called __________ air.
  3. 3. The gas, ___________ remains the same at 78% in inhaled and exhaled air.
  4. 5. The __________ in human allows for gaseous exchange.
  5. 8. Fishes use their ____________ for gaseous exchange.