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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.
Functions of epithelial tissue: 1  the cells of the body's surface form the outer layer of skin. 2  inside the body, epithelial cells form the lining of the mouth and alimentary canal and protect these organs.  epithelial tissues help in absorption of water and nutrients.