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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.
The most basic characteristic of epithelial tissue is that it covers the surfaces of the body, whether external or internal. It acts as a protective covering or boundary for such surfaces, including the outer layer of the skin, as well as the inner surface of hollow organs like the stomach, colon, and blood vessels.ost 8. @fBoyle-- Yes, that's normal because epithelial cells line the vagina, the bladder, the urethra and even the kidney. When these cells are renewing, or when there is some inflammation due to an infection, it's normal for some of the epithelial tissue to be passed into the urine.