Otherwise, the chain of events that occurs in cardiac-muscle contraction is just like that of skeletal muscle. They are spindle-formed, about 50 to 200 microns long and only 2 to 10 microns in diameter. They have no striations or sarcomeres. Instead, they have bundles of skinny and thick filaments (as opposed to effectively-developed bands) that correspond to myofibrils. In clean-muscle cells, intermediate filaments are interlaced via the cell much just like the threads in a pair of "fish-internet" stockings. The intermediate filaments anchor the skinny filaments and correspond to the Z-disks of skeletal muscle. Unlike skeletal-muscle cells, easy-muscle cells have no troponin, tropomyosin or organized sarcoplasmic reticulum. As in skeletal-muscle cells, contraction in a smooth-muscle cell includes the forming of crossbridges and thin filaments sliding previous thick filaments. However, as a result of easy muscle will not be as organized as skeletal muscle, shortening occurs 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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