Stomach peristalsis & Enterogastric reflex
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• Food enters, distending the stomach.
• Stretch receptors activate enteric reflexes that promote peristaltic movements.
• These movements, called mixing waves, begin to mix the food with stomach secretions.
• Mixing waves force the digesting food (chyme) toward and through the pyloric sphincter.
• Most food does not exit the stomach, so it moves back and forth in a churning digestive motion.
• The parasympathetic nervous system stimulates digestive movements in the stomach.
• The enterogastric reflex is triggered when more and more chyme leaves the stomach, distending the stretch receptors in the duodenum.
• The enterogastric reflex:
• Inhibits excessive amounts of chyme entering the duodenum.
• Reduces intestinal cell erosion by limiting inflow of gastric acid.
• Increases duration of digestion of chyme before it is moved to the small intestine.
• The motor impulses in this reflex are sympathetic.