Question

Name the hormone whose secretion is stimulated by the acidic chyme in the intestine .
A. VIP
B. GIP
C. Duocrinin
D. Gastrin

Answer 1

Hint: When the food enters the stomach , it gradually becomes acidic due to the action of acidic gastrin used on it.This acidic food is called chyme. Now further this chyme enters the intestine. The intestine is the long and highly coiled tube of the alimentary canal which performs a major part of digestion.

Complete step by step answer:
-The food becomes acidic after reaching in the stomach by the action of gastrin hormone and is called chyme.
-In the intestine , the acidic pH of the chyme is to be neutralized otherwise it can corrode the epithelial lining of the intestine.
-Thus there is release of some hormones along with the release of bicarbonates and mucus into the intestine to neutralize the acidic pH of chyme.
-Duocrinin is one of the hormones that is released in response to entry of acidic chyme in the intestine.
This is released from the mucosa of duodenum .
-Duocrinin then stimulates the brunner’s gland found in the submucosa of duodenum
Stimulation of brunner’s gland will lead to secretion of non enzymatic alkaline mucous which then neutralizes the acidic chyme.
Hence, the correct answer is option (C) Duocrinin.

Additional Information:
-In addition to duocrinin another hormone called secretin ( which is secreted from duodenum) also helps in neutralizing acidity of chyme in the intestine.
-The digestive juice released from the pancreas contains sodium bicarbonate which also neutralizes the acidity of chyme and also prevents damage of walls of the duodenum.
-Another hormone called cholecystokinin secreted by duodenal cells helps in the neutralization of chyme

Note: All these hormones, bicarbonate ions and mucous are released so that the intestinal lining does not get damaged due to the acidic environment. Absence of these hormonal secretions will lead to severe complications such as intestinal ulcers.