Otherwise, the chain of occasions that occurs in cardiac-muscle contraction is much like that of skeletal muscle. They're spindle-shaped, about 50 to 200 microns long and only 2 to 10 microns in diameter. They don't have any striations or sarcomeres. Instead, they've bundles of thin and thick filaments (as opposed to effectively-developed bands) that correspond to myofibrils. In smooth-muscle cells, intermediate filaments are interlaced by means of the cell a lot just like the threads in a pair of "fish-net" stockings. The intermediate filaments anchor the skinny filaments and correspond to the Z-disks of skeletal muscle. Unlike skeletal-muscle cells, clean-muscle cells haven't any troponin, tropomyosin or organized sarcoplasmic reticulum. As in skeletal-muscle cells, contraction in a clean-muscle cell entails the forming of crossbridges and skinny filaments sliding past thick filaments. However, because easy muscle is just not as organized as skeletal muscle, shortening happens in all directions. During contraction, the graceful-muscle cell's intermediate filaments help to draw the cell up, like closing a drawstring purse.

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