DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Cat colon. Light micrograph of a section through the colon, part of the large intestine, of a cat. The lumen (white) of the colon is at top. It is lined with with villi, small projections that greatly increase the colon's surface area. Goblet cells within the villi secrete mucous, which aids the movement of faeces, while absorptive columnar epithelial cells absorb water from the faeces. Across bottom are two layers of smooth muscle (red), which contract and relax to push faeces along the intestine. Magnification: x2 when printed at 10 centimetres wide.
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