Small intestine, SEM

Small intestine, SEM

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Small intestine. Coloured scanning electron micrograph (SEM) of a cross-section through a foetal small intestine. The small intestine runs from the stomach to the large intestine. It is where digestion is completed and nutrients and water are absorbed into the blood. The interior (lumen) of the small intestine is lined with a highly folded surface. The folds, known as villi, project into the lumen increasing the surface area for absorption. Beneath the villi is the submucosal layer, which contains blood vessels. Beyond the submucosa is a layer of smooth muscle, which contracts and relaxes to move food along the intestine. Magnification: x45 when printed 10 centimetres wide.

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Keywords: anatomy, biological, biology, coloured, cross-section, digestion, digestive, false-colour, false-coloured, fetal, foetal, folded, folds, gut, histological, histology, human body, images, intestinal, lumen, magnified image, microscopic photos, muscle, scanning electron micrograph, scanning electron microscope, sectin, sectioned, sem, small intestine, smooth muscle, subjects, submucosa, system, tissue, tract, vascular, villi, villus

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