Q.Write a detailed account of gastro intestinal tract hormones.

Step 1. A group of specialised endocrine cells embedded in the gastrointestinal tract secrete several hormones that coordinate digestion.

Step 2. Gastrin acts on the gastric glands and stimulates secretion of hydrochloric acid and pepsinogen, supporting protein digestion in the stomach.

Step 3. Cholecystokinin (CCK) is secreted by the duodenum in response to fat and acid in the diet; it acts on the gall bladder to release bile into the duodenum and stimulates secretion and discharge of pancreatic enzymes.

Step 4. Secretin acts on the acinar cells of the pancreas, causing them to secrete bicarbonate ions and water, which neutralise the acidity of the chyme arriving from the stomach. …

Work through the digestive tract's four named hormones in turn, stating each one's trigger and …

• Mixing up CCK's bile/enzyme-release role with secretin's separate acid-neutralising role, since both act on the pancreas but for different purposes. …