#lung  either of two saclike respiratory organs in the chest of vertebrates; serves to remove carbon dioxide and provide oxygen to the blood
  supertype:  #respiratory_organ__respiratoryorgan  any organ involved in the process of respiration
  part of:  #lower_respiratory_tract
  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

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