#respiratory_tract__respiratorytract  the passages through which air enters and leaves the body
  supertype:  #tract  a system of body parts that together serve some particular purpose
  part of:  #respiratory_system
  subtype:  #lower_respiratory_tract__lowerrespiratorytract  the bronchi and lungs
  subtype:  #upper_respiratory_tract__upperrespiratorytract  the nose and throat and trachea

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