diff --git a/19.2-Cardiac-Muscle-And-Electrical-Activity.md b/19.2-Cardiac-Muscle-And-Electrical-Activity.md new file mode 100644 index 0000000..f69c2dc --- /dev/null +++ b/19.2-Cardiac-Muscle-And-Electrical-Activity.md @@ -0,0 +1 @@ +
In comparison with the large cylinders of skeletal muscle, cardiac muscle cells, [Healthy Flow Blood](http://speakingbank.com/bbs/board.php?bo_table=free&wr_id=398915) or cardiomyocytes, are significantly shorter with much smaller diameters. Cardiac muscle additionally demonstrates striations, [Healthy Flow Blood](http://speakingbank.com/bbs/board.php?bo_table=free&wr_id=402824) the alternating pattern of dark A bands and light I bands attributed to the exact arrangement of the myofilaments and fibrils which can be organized in sarcomeres along the length of the cell (Figure 19.17a). These contractile components are just about an identical to skeletal muscle. T (transverse) tubules penetrate from the surface plasma membrane, the sarcolemma, to the interior of the cell, [Healthy Flow Blood](https://morphomics.science/wiki/User:MargoWetherspoon) permitting the electrical impulse to achieve the interior. The T tubules are solely found at the Z discs, whereas in skeletal muscle, they're discovered at the junction of the A and [Healthy Flow Blood supplement](https://wanep.org/wanep/nigeria-niger-delta-crisis-and-yaraduas-administration-critical-issues-hurdles-february-20-2008/) that i bands. Therefore, there are one-half as many T tubules in cardiac muscle as in skeletal muscle. In addition, the sarcoplasmic reticulum stores few calcium ions, so most of the calcium ions should come from exterior the cells.

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Thick and skinny filaments are hooked up to a different structure known as the Z-disk or Z-line, which runs perpendicular to the lengthy axis of the fiber (the myofibril that runs from one Z-line to a different is known as a sarcomere). Running vertically down the Z-line is a small tube referred to as the transverse or T-tubule, which is definitely a part of the cell membrane that extends deep inside the fiber. Inside the fiber, stretching alongside the long axis between T-tubules, is a membrane system called the sarcoplasmic reticulum, which stores and releases the calcium ions that trigger muscle contraction. The thick and thin filaments do the precise work of a muscle, and the best way they do that is pretty cool. Thick filaments are made of a protein referred to as myosin. On the molecular level, a thick filament is a shaft of myosin molecules organized in a cylinder. Thin filaments are made from another protein referred to as actin.
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