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Gastrin
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Diagram of the human stomach showing its external regions and internal layers, with a detailed cross-section highlighting the mucosa, submucosa, muscularis, and serosa, plus insets labeling stomach regions and microscopic histology. Diagram showing how hormones from white adipose tissue, the gastrointestinal tract, and pancreatic islets of Langerhans affect organs such as the brain, stomach, pancreas, liver, adipose tissue, and muscle, with arrows illustrating hormone actions and physiological effects.
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Diagram of the human stomach showing its external regions and internal layers, with a detailed cross-section highlighting the mucosa, submucosa, muscularis, and serosa, plus insets labeling stomach regions and microscopic histology.
structures of the human stomach The stomach has three layers of muscle: an outer longitudinal layer, a middle circular layer, and an inner oblique layer. The inner lining consists of four layers: the serosa, the muscularis, the submucosa, and the mucosa. The mucosa is densely packed with gastric glands, which contain cells that produce digestive enzymes, hydrochloric acid, and mucus.

Gastrin

hormone
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Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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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. In humans, gastrin occurs in three forms: as a 14-, 17-, and 34-amino-acid polypeptide. These forms are produced from a series of enzymatic reactions that cleave the larger proteins into their smaller forms. Gastrin is released into the bloodstream when food enters the stomach and...

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