Segmentation in the digestive tract mixes food with digestive juices and increases the rate of absorption by repeatedly moving different parts of the food mass over the intestinal wall.
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Segmentation is when the contractions of the intestinal wall move chyme in both directions to allow mixing with the secretions of the intestines.
occur in portions of the small intestine distended by a large volume of chyme, it mixes chyme with digestive juices, and bring particles of food into contact with the mucosa for absorption.