#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
  subtype:  athlete's_heart  biauriculate_heart
  part of:  circulatory_system
  part:  coronary_artery__arteria_coronaria__arteriacoronaria  the artery that branches from the aorta to supply blood to the heart
  part:  cardiac_muscle__cardiacmuscle__heart_muscle__heartmuscle  the muscle tissue of the heart; adapted to continued rhythmic contraction
  part:  cardiac_valve__cardiacvalve__heart_valve  a valve to control one-way flow of blood
     part:  cusp.flap__leaflet  a thin triangular flap of a heart valve
  part:  valve.anatomical_structure  a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it

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