Respiratory system

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Across
  1. 2. organs that are used to breathe
  2. 4. also called the windpipe
  3. 5. smaller branches of the bronchial airway
  4. 7. the gas that the human body needs to breathe
  5. 8. oxygen passes to blood through these
Down
  1. 1. to breathe in
  2. 3. dome shaped muscle that makes you breathe
  3. 6. to breathe out