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Microvilli

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Microvilli 

specialized outgrowths of the plasma membrane of epithelial cells in animals and man. Microvilli are 500–3,000 nanometers in length and their diameter ranges from 50 to 100 nm. There are several thousand microvilli in a single cell. Sometimes their arrangement is orderly, as in the striated (brushlike) edges of the epithelial cells of the small intestine, where the microvilli are about 20 nm from each other. Microvilli increase the cell surface. Cuticles in vertebrate animals also consist of microvilli.



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Delta containing vesicles traffic to the microvilli under normal circumstances.
The villi increase the intestinal absorptive surface area 300-fold and microvilli 600-fold, providing a massive absorption surface of the gut lumen for oral insulin.
The function of these three, the plicae circulares, the villi and the microvilli is to increase the amount of inner surface area of the intestine estimated to be 250 sq meters or about the surface size of a tennis court.
 
 
 
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