Initiation of duodenal acid-induced motor complexes

The contractile activity associated with spontaneous migrating myoelectric complexes was recorded from the antrum and duodenum of 11 subjects; complexes always consisted of gastric and duodenal components, each followed by a period of total inhibition of activity. Fifty milliliters of the following solutions were infused into the duodenum at 5 ml/min; 0.9% saline, 100 mM Tris buffer (pH 8.0), and 100 mM HCl. Only HCl initiated contractions …