Jisho

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Noun
1. heart muscle; cardiac muscle; myocardiumAnatomy
Wikipedia definition
2. Cardiac muscleCardiac muscle (heart muscle) is a type of involuntary striated muscle found in the walls and histological foundation of the heart, specifically the myocardium. Cardiac muscle is one of three major types of muscle, the others being skeletal and smooth muscle. The cells that comprise cardiac muscle, called cardiomyocytes or myocardiocyteal muscle cells, can contain one, two, or very rarely three or four cell nuclei.
Read “Cardiac muscle” on English Wikipedia
Read “心筋” on Japanese Wikipedia
Read “Cardiac muscle” on DBpedia

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