STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Gall bladder. Coloured scanning electron micro- graph (SEM) of cells on the wall of the gall bladder. This lining mucosa is made up of columnar epithelial cells, each appearing rounded on the surface. Each cell is covered with small micro- villi (hair-like structures). Microvilli increase the surface area of these cells for absorbing water from bile. Beneath the folded mucosa wall lie sheets of smooth muscle. The gall bladder is a muscular sac attached to the liver. It collects & concentrates liver bile. Bile is then released from the gall bladder down the bile duct and into the duodenum of the intestine, where it aids in the digestion of food by emulsifying fats.
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