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Cholecystokinin is secreted by I-cells in the small intestine and induces contraction of the gall bladder, relaxes the sphincter of Oddi, reduces of gastric acid secretion, increases bile acid production in the liver, delays gastric emptying, and induces digestive enzyme production in the pancreas.
Beta-1 & Beta-2 Receptors: beta-1 receptors: well known for their effects in the heart ( increase rate and force of contraction). induce muscle relaxation in the gut. beta-2 receptors: Induce bronchiodilation. Induce smooth muscle relaxation in the gut. Induce conversion of glycogen to glucose.