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In comparison with the giant cylinders of skeletal muscle, cardiac muscle cells, or cardiomyocytes, are considerably shorter with a lot smaller diameters. Cardiac muscle additionally demonstrates striations, the alternating pattern of dark A bands and mild I bands attributed to the exact association of the myofilaments and fibrils which are organized in sarcomeres alongside the length of the cell (Figure 19.17a). These contractile components are virtually an identical to skeletal muscle. T (transverse) tubules penetrate from the surface plasma membrane, the sarcolemma, to the inside of the cell, allowing the electrical impulse to achieve the interior. The T tubules are only discovered at the Z discs, whereas in skeletal muscle, they're discovered at the junction of the A and that i bands. Therefore, there are one-half as many T tubules in cardiac muscle as in skeletal muscle. In addition, the sarcoplasmic reticulum shops few calcium ions, so many of the calcium ions should come from exterior the cells.
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