Parasympathetic stimulation to the pancreas will cause which of the following reactions?
a. Hormonal inhibition
b. Enzyme secretion
c. Vasoconstriction
d. Decreased bicarbonate production
ANS: B
Pancreatic innervation arises from preganglionic parasympathetic fibers of the vagus nerve. These fibers activate postganglionic fibers, which stimulate enzymatic and hormonal secretion. Pancre-atic innervations stimulate hormone secretion, not inhibit it. Sympathetic postganglionic fibers from the celiac and superior mesenteric plexuses innervate the blood vessels, cause vasocon-striction, and inhibit pancreatic secretion. Parasympathetic stimulation is not involved in bicar-bonate production.
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