RESPIRATORY SYSTEM

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