Segmentation and migrating motility complexes & Gastroileal reflex

• Within a few hours, most of the stomach contents are in the duodenum. • Distension of stretch receptors in the small intestine activates a reflex that stimulates segmentation, a mixing movement. • During segmentation, sections of the intestine are constricted. • This movement increases digestion and absorption in the small intestine. • There is no net movement of chyme. • Migrating motility complexes are peristaltic movements stimulated by a decrease in distension once most nutrients have been absorbed. • Migrating motility complexes propel undigested and liquefied chyme toward the ileocecal valve. • The ileocecal valve is normally closed, so chyme cannot enter the large intestine. • The gastroileal reflex is triggered when food enters and distends the stomach. • Migrating motility complexes are intensified by this reflex, forcing chyme through the ileocecal valve into the cecum.

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