DIGESTIVE TRACT
Numerous hormones secreted by the digestive tract control smooth
muscle activity and secretions in the digestive tract. For example, the hormone
gastrin is secreted by the stomach
when peptides and amino acids are present in the chyme. This results in
in-creased gastric secretion and motility. Similarly, the arrival of lipids and
carbohydrates in the duodenum stimulates secretion of the hormone cholecys-tokinin (CCK) and gastric inhibitory peptide (GIP).Both
hormones slow the motility of the stomach and gastric secretion to allow more
time for lipids to be digested and absorbed in the intestines. Many such
hormones have been identified in the digestive tract. Please refer to more
advanced textbooks for details.
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