Definition of Muscle, heartMuscle, heart: A type of muscle with unique features only found in the heart. The heart or cardiac muscle is medically called the myocardium ("myo-" being the prefix denoting muscle). Source: MedTerms™ Medical Dictionaryhttp://www.medterms.com/script/main/art.asp?articlekey=9657 Last Editorial Review: 6/14/2012
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