#atrioventricular_valve  either of two heart valves through which blood flows from the atria to the ventricles; prevents return of blood to the atrium
  supertype:  #cardiac_valve__cardiacvalve__heart_valve  a valve to control one-way flow of blood
  subtype:  #mitral_valve  #tricuspid_valve
  part:  #papillary_muscle__papillarymuscle  any of several muscles associated with the atrioventricular valves; "the papillary muscles contract during systole to prevent regurgitation of blood into the atria"

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