Flexi Says: The digestive system includes a number of highly specialized cell types, each differentiated to perform a specific function. Absorptive cells or enterocytes, are the predominant epithelial cell type lining the lumen of the small intestine and colon with microvilli. Goblet epithelial cells are specialized for secretion of mucus, which facilitates passage of material through the bowel. Hepatocytes of the liver has so many functions like form and secrete bile, store glycogen and buffer blood glucose, synthesize urea. Parietal cells of the stomach secrete acid, by pumping hydrogen ions across the cell membrane. Chief cells of the stomach secrete the digestive enzymes. Serous cells in pancreas, are glandular epithelial cells specialized for exocrine enzyme secretion