#lower_respiratory_tract__lowerrespiratorytract  the bronchi and lungs
  supertype:  respiratory_tract__respiratorytract  the passages through which air enters and leaves the body
  part:  lung  either of two saclike respiratory organs in the chest of vertebrates; serves to remove carbon dioxide and provide oxygen to the blood
     part:  bronchial_artery__bronchialartery  arteries that accompany the bronchioles
     part:  pulmonary_vein__pulmonaryvein__vena_pulmonalis  any of four veins that carry arterial blood from the lungs to the left atrium of the heart
     part:  alveolar_bed  lung tissue densely packed with alveoli
     part:  lobe_of_the_lung  any of the three lobes of the right lung or the two lobes of the left lung
     part:  alveolus__air_sac__air_cell__aircell  a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
  part:  bronchus__bronchial_tube__bronchialtube  either of the two main branches of the trachea
  part:  bronchiole  any of the smallest bronchial tubes; ending in alveoli

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