respiratory system

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Across
  1. 3. carries air in and out of your lungs
  2. 5. protects the organs
  3. 6. a tiny branch of air tubes in the lungs
  4. 7. a blood vessel
  5. 9. helps you smell
  6. 11. carries air into your lungs
  7. 12. A pair of organs in your chest
Down
  1. 1. separates the lungs from your stomach
  2. 2. co2
  3. 4. the process where molecules move
  4. 8. They allow oxygen to pass into your blood
  5. 10. it gives energy to the cells