Breathing

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Across
  1. 6. Contract during inhalation
  2. 7. Increases inside the thorax when the diaphragm and muscles contract
Down
  1. 1. Breathing out
  2. 2. Breathing in
  3. 3. Decreases inside the lungs when the diaphragm muscles contract
  4. 4. Lifts and moves out during inhalation
  5. 5. A sheet of muscle under the lungs