Lungs

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Across
  1. 3. tubes carrying air to the lungs.
  2. 4. bones that protect the lungs.
  3. 6. smaller branches of bronchi.
  4. 8. tube taking oxygen to the lungs.
Down
  1. 1. another way to take oxygen into your body.
  2. 2. muscle that flattens and arches as you breathe.
  3. 5. one way to take oxygen into your body.
  4. 7. major organ in respiratory system.
  5. 9. air sacs where oxygen comes in and carbondioxide out.