Question

Role of gastrointestinal hormones on secretion and control of enzymes of gastrointstinal tract

Answer 1

Ans:-

Hormone # 1. Gastrin:

This hormone is secreted by gastrin cells (= G-cells) in the pyloric region of the stomach. It stimulates gastric glands to secrete and release the gastric juice. It also stimulates gastric mobility.

Hormone # 2. Enterogastrone:

(Gastric Inhibitory Peptide— GIP)

It is se­creted by the duodenal epithelium. It inhibits gastric secretion and motality. It slows gastric contrac­tion, hence it is also called gastric inhibitory peptide.

Hormone # 3. Secretin:

It was the first hormone to be discovered by scien­tists. It is secreted by the epithelium of duodenum. It releases bicarbon­ates in the pancreatic juice. It increases secretion of bile. It de­creases gastric secretion and motality.

Hormone # 4. Cholecystokinin pancre­ozymin

This hormone is secreted by the epithelium of entire small intestine. It stimulates the gall bladder to release bile and pancreas to secrete and release digestive enzymes in the pancreatic juice.

Hormone # 5. Duocrmin:

It is secreted by the duodenal epithelium and stimulates the Brunner’s glands to release mucus and enzymes into the intestinal juice.

Hormone # 6. Enterocrinin:

It is secreted by the epithelium of entire small intestine. It stimulates the crypts of Lieberkuhn to release enzymes into the intestinal juice.

Hormone # 7. Vasoactive Intestinal Peptide (VIP):

It is secreted by the epithelium of entire small intestine. It dilates peripheral blood vessels of the gut. It also inhibits gastric acid secretion.

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