SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY
Small intestine. Coloured scanning electron micrograph (SEM) of the duodenum, the first part of the small intestine. Its inner lining is covered in tiny projections known as villi (orange/yellow), which create a large surface area for the absorption of food-derived molecules into the bloodstream. Magnification: x22 at 6x7cm size.
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