Physiology MCQ Answer 38
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Mass movement is responsible for moving colonic contents into the rectum. Segmentation contractions are responsible for mixing the contents of the colon, and peristaltic contractions only move the contents a short distance. The recto-sphincteric reflex occurs when fecal material is in the rectum - the rectum contracts and the internal anal sphincter relaxes. There is no MMC in the large intestine.
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