标题: Why Healthy Flow Blood Is Your Key to More Energy [打印本页] 作者: MaribelX29 时间: 2025-10-19 12:09 标题: Why Healthy Flow Blood Is Your Key to More Energy In comparison with the enormous cylinders of skeletal muscle, cardiac muscle cells, or cardiomyocytes, are considerably shorter with much smaller diameters. Cardiac muscle also demonstrates striations, the alternating pattern of dark A bands and gentle I bands attributed to the exact association of the myofilaments and fibrils which might be organized in sarcomeres along the size of the cell (Figure 19.17a). These contractile elements are virtually similar to skeletal muscle. T (transverse) tubules penetrate from the surface plasma membrane, the sarcolemma, to the interior of the cell, permitting the electrical impulse to achieve the interior. The T tubules are solely discovered at the Z discs, whereas in skeletal muscle, they are 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. As well as, the sarcoplasmic reticulum shops few calcium ions, so a lot of the calcium ions should come from exterior the cells.