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X-ray radiograph of the large intestine following a barium sulphate enema. The lumbar spine is prominent in centre of image, with both hip joints visible at bottom. Features of the large intestine visible include the caecum (bottom left), leading to he ascending colon (left), transverse colon (centre) and the descending colon (right) which connects with the anus via the rectum. The colon has no digestive function but it absorbs large amounts of water and electrolytes from undigested food passed on from the small intestine. Strong peristaltic contractions periodically propel the dehydrated contents (faeces) towards the rectum.
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