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polypeptide (pol″e-pepĀ“tīd)   a peptide containing two or more amino acids linked by a peptide bond; called dipeptide, tripeptide, and so on depending on the number of amino acids present.
 

gastric inhibitory polypeptide(GIP)    a peptide hormone synthesized by K cells in the mucous membranes of the duodenum and jejunum and released in response to glucose, fat, or amino acids in the diet; it is a potent insulin stimulant, increases insulin secretion, and inhibits the processes of secretion and motility in the stomach.

vasoactive intestinal polypeptide(VIP)    a peptide hormone that, in addition to its vasoactive properties, stimulates intestinal secretion of water and electrolytes, inhibits gastric secretion, promotes glycogenesis, causes hyperglycemia, and stimulates production of pancreatic juice. See also VIPoma.





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