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Synonyms
cardiac muscle, myocardium, muscle of heart, Myocardium
General information
The middle layer of the heart; the cardiac muscle consists of anastomosing transversely striated muscle fibers formed of cells united at intercalated disks, the one or two nuclei of each cell are centrally located and the longitudinally arranged myofibrils have considerable sarcoplasm around them; connective tissue is limitted to reticular and fine collagenous fibers
Furthermore, the unexpected finding that LFA-3 is strongly expressed on intercalated discs of cardiac muscle may possibly be related to a non-immune function, or indicate a structurally similar epitope expressed by an unrelated molecule within this tissue. [1]
Actions of the beta1 receptor include the increase in cardiac output via increasing the heart rate in the sinotrial node,increasing atrial cardiac muscle contractility, increasing contractility and automaticity of the ventricular cardiac muscle and increasing conduction and automaticity of the atrioventricular node. [2]