Acinar cells
Yes, CCK would be activated in response to a heavy fat and protein meal, which would then drive a pancreatic secretion that is rich in enzymes.
Nearly all of the digestive enzymes required for nutrition digestion that are active in the small intestinal lumen are synthesised and secreted by pancreatic acinar cells. To ensure a sufficient supply of digestive enzymes, both synthesis and secretion are tightly controlled over short and long time scales.
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