Small intestine surface, SEM

Small intestine surface, SEM

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Caption: Intestinal surface. Coloured scanning electron micrograph (SEM) of a sectioned villus (fold) on the lining of the small intestine. Villi greatly increase the intestinal surface area for absorbing nutrients from food. The epithelium (outer layer, folded) of a villus contains enterocyte cells, which are involved in nutrient absorption, and goblet cells, which secrete mucus onto the intestinal surface. The inner villus tissue, that is exposed by this section, will contain blood vessels for the transport of digestive products to a nearby vein. Magnification: x175 at 6x7cm size.

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Keywords: absorption, absorptive, alimentary canal, anatomy, coloured, digestion, digestive system, gut, healthy, histology, human body, lining, mucosa, mucosal, normal, nutrient, projection, projections, scanning electron micrograph, secretory, sem, site, small intestine, surface area, tissue, tract, villus

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