Epithelium,unlike connective tissue,is _____,which means that it never has a blood supply of its own.

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Epithelium is avascular,having no blood supply of its own.Cellular nutrition consisting of oxygen and metabolites is obtained by diffusion from the adjoining connective tissue,which is usually highly vascularized,providing its own source of nutrition.Stratified epithelium consists of two or more layers of cells,with only the deepest layer lining up to contact the basement membrane.Simple epithelium consists of a single layer of epithelial cells.The keratin within the keratinized tissue is a tough,fibrous,opaque,waterproof protein that is impervious to pathogenic invasion and resistant to friction; this is not present in nonkeratinized tissue.

Epithelium,unlike Connective Tissue,is _____,Which Means That It Never Has a Blood