gastrin

[gas-trin]
noun
a hormone that stimulates the secretion of gastric juice.

Origin:
1900–05; gastr- + -in2

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
gastrin (ˈɡæstrɪn)
 
n
a polypeptide hormone secreted by the stomach: stimulates secretion of gastric juice

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

gastrin gas·trin (gās'trĭn)
n.
Any of the hormones secreted in the pyloric-antral mucosa of the stomach and that stimulate secretion of the parietal cells.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

gastrin

any of a group of digestive hormones secreted by the wall of the pyloric end of the stomach (the area where the stomach joins the small intestine) of mammals. Gastrin is a polypeptide. Released into the bloodstream when food enters the stomach, gastrin is carried by the circulatory system to the gastric cells in the stomach wall, where it triggers the secretion of gastric juice. This juice consists primarily of hydrochloric acid, which helps break apart fibrous matter in food and kills bacteria that may have been ingested, and pepsinogen, which is a precursor of the protein-splitting enzyme pepsin. Gastrin also increases the motility of the stomach, thereby helping to churn the food and eventually to empty the stomach; to a lesser degree, gastrin also increases the motility of the upper small intestine and the gallbladder.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Gastrin is the major hormone that controls the release of acid in your stomach.
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