THORAX ABDOMEN AND PELVIS

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: -Due to the presence of gastric juices, chyme becomes acidic. This acidity can damage the intestines. Hence to neutralize it basic fluid such as sodium bicarbonate is secreted into the intestine. This sodium bicarbonate is secreted by the pancreas.

Detailed explanation-3: -Functions of the pancreas When they enter the duodenum, they are activated. The exocrine tissue also secretes a bicarbonate to neutralize stomach acid in the duodenum. This is the first section of the small intestine.

Detailed explanation-4: -Upon entering the duodenum, the chyme causes the release of two hormones from the small intestine: secretin and cholecystokinin (CCK, previously known as pancreozymin) in response to acid and fat, respectively.