Generally the hormones secretin and cholecystokinin which are released by duodenal enteroendocrine cells will

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In general, the duodenal enteroendocrine cells release the hormones cholecystokinin and secretin and these enteroendocrine cells will then slow the stomach's activity. Specifically, these cells are responsible for the control of the levels of glucose, emptying of the stomach, as well as food intake. 

The direction a chemical reaction occurs is represented by an arrow