#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"
  supertype:  cardiac_muscle__cardiacmuscle__heart_muscle__heartmuscle  the muscle tissue of the heart; adapted to continued rhythmic contraction
  part of:  atrioventricular_valve  either of two heart valves through which blood flows from the atria to the ventricles; prevents return of blood to the atrium

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