RESPIRATORY SYSTEM

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Across
  1. 2. Muscle located under the lungs
  2. 6. Exhalation of breath from the lungs
  3. 8. Branches of trachea which enters the lungs
Down
  1. 1. Main organ of respiratory system
  2. 3. Double layered protective membrane of the lungs
  3. 4. Tiny sacs within the lungs where gaseous exchange occur
  4. 5. Taking air into the lungs
  5. 7. The wind pipe