The body surface includes the exterior surface and the lining of digestive and respiratory tracts and many body cavities.
Epithelial tissue forms the covering of all body surfaces, line body cavities and hollow organs, and are the major tissue in glands. The body surface includes the exterior surface and the lining of digestive and respiratory tracts and many body cavities.
Epithelial tissue specializes in moving substances into and out of the blood, and forms many glands. Skin is not the only area of the body exposed to the outside. Other areas include the airways, the digestive tract, as well as the urinary and reproductive systems, all of which are lined by an epithelium.
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