Respiratory System

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Across
  1. 3. very small tubes
  2. 5. two bags that expand and shrink
  3. 8. gas that goes into the body
  4. 9. two smaller tubes
Down
  1. 1. tube
  2. 2. dioxide, gas that leaves the body
  3. 4. lots of little bags that move air to the blood
  4. 6. air enters through two openings
  5. 7. air enters over the tongue