The Respiratory System

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Across
  1. 2. inflating and deflating the lungs
  2. 4. chemical compound composed of one carbon and two oxygen atoms
  3. 7. the small air tubes that connect the bronchus to the alveoli
  4. 8. the pipe that sends air to the lungs
  5. 10. what you use to smell
  6. 11. where oxygen and nutrients are exchanged for carbon dioxide and waste
Down
  1. 1. occurs in liquids and gases when their particles collide randomly and spread out
  2. 3. what you use to breath
  3. 5. need it to breath
  4. 6. air sacs that exchange oxygen and carbon dioxide in the blood
  5. 7. is found at the end of the end of the end
  6. 9. protects organs