MICROSCAPE / SCIENCE PHOTO LIBRARY MICROSCAPE / SCIENCE PHOTO LIBRARY
Enterocyte. Transmission electron micrograph (TEM) of a section through the cytoplasm and part of the nucleus of an enterocyte cell located in a crypt of Lieberkuhn of the small intestine, showing an abundance of rough endoplasmic reticulum (dark lines), Golgi membranes ((semi-circular lines) and vesicles (dark circles). Crypt enterocytes secrete intestinal fluid, an electrolyte solution that is taken up by the enterocytes of the villous epithelium and assists with their absorption of nutrients from the gut. Crypts of Lieberkuhn contain the intestinal epithelial stem cells that constantly proliferate to renew the enterocytes lost from the upper regions of the villi. Magnification: x20,000 when printed 10 centimetres tall.
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