STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Gall stone. Coloured scanning electron micrograph (SEM) of a gall stone within the gall bladder. The gall bladder expels bile (a fat emulsifier) into the intestine. It has a wall mucosa that is highly folded (pink) which gives it a honeycombed appear- ance. A gall stone (yellow) is a hard deposit of salts or cholesterol that forms in the gall bladder when the chemical composition of bile is upset. Gall stones are most common in women, the elderly and obese. They usually cause no symptoms unless one becomes stuck in the bile duct, which can lead to acute pain, jaundice and infection. Surgical removal of the gall bladder is sometimes necessary. Magnification: unknown.
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