Small Intestine Anatomy
by Science Photo Library
Title
Small Intestine Anatomy
Artist
Science Photo Library
Medium
Photograph - Photograph
Description
Illustration of sections through the small intestine. The small intestine is where digestion begins and nutrients are absorbed into the blood. The lumen (centre) is lined with villi (shown in inset at right), the folds in the intestinal surface that greatly increase the surface area for absorption. Surrounding the villi is the mucosa (blue), which has a layer of smooth muscle that mixes the food as it passes through the lumen. It also contains mucus secreting goblet cells (green) and glands (purple). Surrounding this is circular and then longitudinal muscle tissue, the peristaltic action of which pushes food along the intestine.
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July 28th, 2016
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