papillary muscle

Noun
  1. Any of several muscles associated with the atrioventricular valves (synset 105397576)
    "the papillary muscles contract during systole to prevent regurgitation of blood into the atria"
    is a type of: cardiac muscle, heart muscle - the muscle tissue of the heart; adapted to continued rhythmic contraction
    is a 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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