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Key points. 1  Intestinal epithelial cells (IECs) provide a physical and biochemical barrier that segregates host tissue and commensal bacteria to maintain intestinal homeostasis. 2  Secretory IECs support this function through the secretion of mucins and antimicrobial peptides.ey points. 1  Intestinal epithelial cells (IECs) provide a physical and biochemical barrier that segregates host tissue and commensal bacteria to maintain intestinal homeostasis. 2  Secretory IECs support this function through the secretion of mucins and antimicrobial peptides.
Once again, it is epithelial cells that make and secrete the enzymes in your stomach. Epithelial cells also secrete hormones into your blood vessels, mucous in your nose and the breast milk which mothers feed their young.