human_reference_atlas has characterizing marker set has marker component TTN MYL7 FHL2 MYH7 MYL2 MYL4 NPPA cell cell type (from CL) muscle cell cardiac muscle cell cardiomyocyte BTO:0001539 CALOHA:TS-0115 FMA:14067 CT cardiocyte cardiac muscle fiber FMA:83808 MESH:D032383 cardiomyocyte CL:0000746 cardiac myocyte Cardiac muscle cells are striated muscle cells that are responsible for heart contraction. In mammals, the contractile fiber resembles those of skeletal muscle but are only one third as large in diameter, are richer in sarcoplasm, and contain centrally located instead of peripheral nuclei. heart muscle cell cardiomyocyte This class encompasses the muscle cells responsible for heart* contraction in both vertebrates and arthropods. The ultrastucture of a wide range of arthropod heart cells has been examined including spiders, horseshoe crabs, crustaceans (see Sherman, 1973 and refs therein) and insects (see Lehmacher et al (2012) and refs therein). According to these refs, the cells participating in heart contraction in all cases are transversely striated. Insects hearts additionally contain ostial cells, also transversely striated muscle cells, but which do not participate in heart contraction. Homo sapiens sequence collection heart right cardiac atrium left cardiac atrium heart right ventricle heart left ventricle interventricular septum cardiac muscle of right atrium left ventricle myocardium right ventricle myocardium Septomarginal trabecula Myocardium of left atrium Myocardium of interventricular septum