SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY
Mucous membrane. Coloured scanning electron micrograph (SEM) of the inside of a colon, showing the mucous membrane. A mucous membrane consists of an epithelial surface layer containing glands that secrete mucus. Below this are layers of connective tissue. The colon is the part of the large intestine joining the rectum and the cecum. It is mainly responsible for absorbing water from faeces.
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