The Respiratory System

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Across
  1. 6. tiny blood cells
  2. 7. net passive movement
  3. 8. colorless acid with gas
  4. 11. an organ that collects air
  5. 12. A pipe that sends air to the lungs
Down
  1. 1. air sac
  2. 2. small air tubes
  3. 3. Something you use to smell things
  4. 4. chemical that has O
  5. 5. splits the air into each lungs
  6. 9. bones that cover lungs
  7. 10. a muscle that inflates and deflates lungs