The Respiratory System

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Across
  1. 3. When this moves our lungs expand and contract.
  2. 6. Air comes into our bodies through these or our mouth.
  3. 8. This is the system that allows our bodies to absorb oxygen, passes it to our blood and expels the carbon dioxide.
  4. 10. When our lungs get bigger they ______ .
Down
  1. 1. They absorb the oxygen from the air we breathe.
  2. 2. The gas our bodies breathe out.
  3. 4. Our bodies need this to survive.
  4. 5. When our lungs get smaller they ______ .
  5. 7. When we breathe out our diaphragm goes ______ .
  6. 9. When we breathe in our diaphragm goes ______ .