The respiratory system

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Across
  1. 4. The main organs of the Respiratory system
  2. 6. A tube that connects the throat and lungs
  3. 7. The process of breathing in
Down
  1. 1. The muscle that helps breathing
  2. 2. The passage that branches from the trachea
  3. 3. The small air sacs in the lungs
  4. 5. The upper part of the Respiratory System
  5. 8. Organ that filters before entering the lungs