#cardiac_valve__cardiacvalve__heart_valve  a valve to control one-way flow of blood
  supertype:  valve.anatomical_structure  a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it
  part:  cusp.flap
  part of:  heart.internal_organ
  subtype:  atrioventricular_valve  either of two heart valves through which blood flows from the atria to the ventricles; prevents return of blood to the atrium
     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
  subtype:  semilunar_valve__semilunarvalve  a heart valve with half-moon-shaped cusps; prevents blood from flowing back into the heart
     subtype:  aortic_valve  a semilunar valve between the left ventricle and the aorta; prevents blood from flowing from the aorta back into the heart
     subtype:  pulmonary_valve__pulmonaryvalve  a semilunar valve between the right ventricle and the pulmonary artery; prevents blood from flowing from the artery back into the heart

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