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Noun heart muscle has 1 sense
  1. cardiac muscle, heart muscle - the muscle tissue of the heart; adapted to continued rhythmic contraction
    --1 is a kind of muscle, muscular tissue
    --1 is a part of heart, pump, ticker
    --1 has particulars:
     pacemaker, cardiac pacemaker, sinoatrial node, SA node; papillary muscle; atrioventricular bundle, bundle of His, atrioventricular trunk, truncus atrioventricularis; atrioventricular node; myocardium; Purkinje fiber; Purkinje network, Purkinje's tissue, Purkinje's system
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