heart muscle

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WordNet Dictionary
	Definition:		[n]  the muscle tissue of the heart; adapted to continued rhythmic contraction
	Synonyms:		cardiac muscle
	See Also:		atrioventricular bundle, atrioventricular node, atrioventricular trunk, bundle of His, cardiac pacemaker, heart, muscle, muscular tissue, myocardium, pacemaker, papillary muscle, pump, Purkinje fiber, Purkinje network, Purkinje's system, Purkinje's tissue, SA node, sinoatrial node, ticker, truncus atrioventricularis