BSIP VEM / SCIENCE PHOTO LIBRARY BSIP VEM / SCIENCE PHOTO LIBRARY
Colon. Coloured Scanning Electron Micrograph (SEM) of the inside wall of the human colon (large intestine). The large pit, called a crypt of Lieberkuhn, contains glandular tissue that includes both mucus-secreting cells and absorptive cells. It is surrounded by lots of smaller goblet cells that solely secrete mucus. The colon absorbs water and vitamins from the remains of digested food, leaving behind faeces. Its surface consists of a mucous membrane covered with a thick, lubricating mucus that both protects the colon and keeps faeces moving. Magnification unknown.
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