The respiratory system

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Across
  1. 3. A tube the Oxygen travels down
  2. 6. Building blocks of life
  3. 7. You breathe it in
  4. 9. Small airways in your lungs
Down
  1. 1. The process of taking in oxygen for your body
  2. 2. Something thatś not needed and harmful
  3. 4. A waste product that is exhaled
  4. 5. Tiny sacks at the end of the bronchioles
  5. 8. Something that makes the body function
  6. 10. You have 2; contains most respitory system parts