BIOMEDICAL IMAGING UNIT, SOUTHAMPTON GENERAL HOSPITAL / SCIENCE PHOTO LIBRARY BIOMEDICAL IMAGING UNIT, SOUTHAMPTON GENERAL HOSPITAL / SCIENCE PHOTO LIBRARY
Intestinal bacteria. Coloured scanning electron micrograph (SEM) of bacteria (red) on the surface of the duodenum. The duodenum is the first part of the small intestine, the part that receives food from the stomach. A healthy human intestine has a large population of bacteria, most of which are harmless and some of which aid digestion. Cases of food poisoning often involve a bacterial strain that upsets the digestive system. The brown lumps are the intestinal villi, and the white, hair-like structures are microvilli, which absorb nutrients from food. Magnification: x2100 when printed 10cm high.
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