the respiratory system

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Across
  1. 2. main muscle for breathing
  2. 3. tube that carries air from the throat to the lungs
  3. 5. windpipe
  4. 9. smallest air passages in the lungs
Down
  1. 1. bacteria infection in the lungs
  2. 4. taking air into the lungs
  3. 6. tiny air sacs in the lungs
  4. 7. the voice box
  5. 8. breathing and vital for respiration