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Phases of Digestion

How many Phases of Digestion? Cephalic Phase During the cephalic phase of digestion, the smell, sight, thought,or initial taste of food activates neural centers in the cerebral cortex, hypothalamus, and brain stem. The brain stem then activates The facial (VII),glossopharyngeal (IX), and vagus (X) nerves.The facial and glossopharyngeal nerves stimulate the salivary glands to secrete saliva, while the vagus nerves stimulate the gastric glands to secrete gastric juice. The purpose of the cephalic phase of digestion is to prepare the mouth and stomach for food that is about to be eaten. Gastric Phase : Once food reaches the stomach, the gastric phase of digestion begins. Neural and hormonal mechanisms regulate the gastric phase of digestion to promote gastric secretion and gastric motility. • Neural regulation. Food of any kind distends the stomach and stimulates stretch receptors in its walls.Chemoreceptors in the stomach monitor the pH of the stomach chyme. When the stomach walls are di...