#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
  part:  papillary_muscle
  subtype:  mitral_valve__bicuspid_valve__left_atrioventricular_valve  valve with two cusps; situated between the left atrium and the left ventricle
  subtype:  tricuspid_valve__tricuspidvalve__right_atrioventricular_valve  valve with three cusps; situated between the right atrium and the right ventricle; allows blood to pass from atrium to ventricle and closes to prevent backflow when the ventricle contracts

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