(= Classification of Epithelia Epithelia mainly classified into 2 sorts: Covering epithelia: Cells arranged like membrane Localization: covering the outer sur face of the body and the inner surface of the cavities sacs or ducts within the body Function: Protection Glandular epithelia: Function- Secretion（二）Classification of Epithelia Epithelia mainly classified into 2 sorts: Covering epithelia：Cells arranged like membrane Localization: covering the outer surface of the body and the inner surface of the cavities ,Sacs or ducts within the body. Function: Protection. Glandular epithelia：Function- Secretion