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JoleneKees

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

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