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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.
Epithelial Tissue & functions, types of epithelia in digestive tract Epithelial Tissue Epithelium is an animal tissue and is one of the four basic types of tissues in animal. These tissues cover the structures in the whole body and line cavities. They also form different types of glands. Selective absorption, secretion , transport across cells, protection and detecting sensation are its functions. A special category of this epithelial tissue is epidermis. The epithelial tissue is located above the connective tissue.