#cardiac_muscle__cardiacmuscle__heart_muscle__heartmuscle  the muscle tissue of the heart; adapted to continued rhythmic contraction
  supertype:  muscular_tissue__muscle  animal tissue consisting predominantly of contractile cells
  subtype:  cardiac_pacemaker  papillary_muscle  atrioventricular_bundle  atrioventricular_node  myocardium  Purkinje_fiber  Purkinje_network
  part of:  heart.internal_organ__pump__ticker  the hollow muscular organ located behind the sternum and between the lungs; its rhythmic contractions pump blood through the body; "he stood still, his heart thumping wildly"
     part of:  circulatory_system__circulatorysystem__cardiovascular_system  the organs and tissues involved in circulating blood and lymph through the body
        part of:  body__organic_structure__organicstructure__physical_structure  the entire physical structure of an organism (especially an animal or human being); "he felt as if his whole body were on fire"

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