#heart.internal_organ__pump__ticker  the hollow muscular organ located behind the sternum and between the lungs; its rhythmic contractions pump blood through the body; "he stood still, his heart thumping wildly"
  supertype:  #internal_organ__viscus  a main organ that is situated inside the body
  part:  #coronary_artery  #cardiac_muscle  #cardiac_valve  #valve.anatomical_structure
  part of:  #circulatory_system
  subtype:  #athlete's_heart  enlarged heart commonly found among athletes trained for endurance
  subtype:  #biauriculate_heart  a heart (as of mammals and birds and reptiles) have two auricles

No statement uses or specializes #heart.internal_organ; click here to add one.