Physiology MCQ Answer 34
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It is during the intestinal phase of pancreatic secretions that you need the enzymes. So CCK, secreted from the I cells in the duodenum in response to fat and protein digestion products, acts on the acinar cells to increase enzyme secretion. CCK also potentiates the response of the ductal cells to secretin. Na+ concentrations are always isotonic with plasma and do not change with flow rate. HCO3- concentrations are always higher than plasma at all flow rates, and it enters the lumen in exchange for Cl-. The rate of bicarbonate secretion is dependent on the amount of Cl- present in the lumen.
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