PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY
Assorment of X-ray images of the human abdomen showing the large intestine (colon). Contrast has been enhanced by a barium enema, whereby a suspension of barium sulphate (opaque to x-rays) is infused into the rectum. The colon consists of ascending, transverse, descending & sigmoid sections - the sigmoid colon is s-shaped & connects with the rectum. The colon is marked by haustra, compartments produced by infoldings of the mucular layer which supports the mucosal interior. Absorption of water and electrolytes takes place in the colon; periodic muscular contractions move the dehydrated contents towards the rectum.
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