Respiratory System :D

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Across
  1. 3. Upper part of the respiratory tract
  2. 4. It acts like a valve, separating the food from the air
  3. 6. Allows air in and out of the body.
  4. 8. tiny air sacs that exchange oxygen and carbon dioxide
  5. 9. tube connecting to the lungs.
Down
  1. 1. fill with air when you inhale
  2. 2. The system that is responsible for taking in oxygen and expelling carbon dioxide.
  3. 3. tiny blood vessels that wrap around the alveoli
  4. 5. Split tube going from trachea to each lung
  5. 7. tiny hair like structures that protect the respiratory system