MICROANATOMY

Detailed explanation-1: -Secretin stimulates the secretion of bicarbonate-rich pancreatic fluid. [11] Secretin enters the intestinal lumen and stimulates bicarbonate secretion, ultimately neutralizing gastric H+, which plays an essential role in fat digestion by creating a more neutral (pH 6 to 8) environment.

Detailed explanation-2: -Abstract. Calcitonin in pharmacological dosage inhibits the secretion of enzymes in the human pancreas without influencing the production of fluid and bicarbonate. The degree of inhibition is the same in a juice stimulated by secretin alone and by secretin plus pancreozymin-cholecystokinin or caerulein.

Detailed explanation-3: -Protein digestion products in the stomach release gastrin, resulting in the stimulation of pancreatic enzyme secretion and gastric acid secretion. Gastric distention stimulates gastric mechanoreceptors, which in turn stimulate parietal cells through vagal reflexes. H+ stimulates duodenal secretin release.