DAVID M. MARTIN, MD / SCIENCE PHOTO LIBRARY DAVID M. MARTIN, MD / SCIENCE PHOTO LIBRARY
Large intestine. Colonoscope (endoscope) view of the mucous membrane (mucosa) surface of the colon, the major part of the large intestine. The primary function of the colon is to absorb water from digested food. Its surface is covered in a thick mucus that both protects the colon and keeps faeces moving.
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