Respiratory System

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Across
  1. 3. A word meaning "To breathe out".
  2. 5. Where the oxygen passes from the air into our blood which we have 2 of.
  3. 6. The gas which you breathe out.
  4. 9. Our body needs ___ from the air in order to survive.
Down
  1. 1. A word meaning 'to breathe in'.
  2. 2. The name of the system we use to breathe in air.
  3. 4. When we breathe in, air can enter through this, starting with 'm'.
  4. 7. The name of the two small tubes which lead to our lungs.
  5. 8. When we breathe in, air can enter through this, starting with 'n'.