Line the cavities and surfaces of blood vessels and organs throughout the body.
the function of epithelial tissue include: transportation of materials, protection of underlying tissues, absorption of water and nutrients and secretion of waste products. 4 people found this useful. Edit.  Epithelium (epi- + thele + -ium) is one of the four basic types of animal tissue. The other three types are connective tissue, muscle tissue and nervous tissue. Epithelial tissues line the cavities and surfaces of blood vessels and organs throughout the body. There are three principal shapes of epithelial cells: squamous, columnar, and cuboidal. These can be arranged in a single layer of cells as simple epithelium, either squamous, columnar or cuboidal, or in layers of two or more cells deep as stratified (layered), either squamous, columnar or cuboidal. All glands are made up of epithelial cells Internally, epithelial tissue serves some of the same functions as the epidermis or external epithelium, lining the surfaces of all body cavities and providing a protective layer to internal body surfaces. Sweat glands in the epidermis enable sweat to evaporate from the body. The kidneys are made up of epithelial tissue. The liver is made up of epithelial tissue. The epidermis creates a tough, renewable, waterproof barrier that protects human bodies against the environment. Epithelial tissue, also called epithelium, is one of the four main types of tissue found in animals, including humans. It completely covers, or lines, all external body surfaces as well as nearly all internal body surfaces. Sweat glands in the epidermis enable sweat to evaporate from the body. The kidneys are made up of epithelial tissue. The liver is made up of epithelial tissue. The epidermis creates a tough, renewable, waterproof barrier that protects human bodies against the environment. 1 Epithelial cells form the thin layer of cells known as the endothelium, which is continuous with the inner tissue lining of organs such as the brain, lungs, skin, and heart. 2  The free surface of epithelial tissue is usually exposed to fluid or the air, while the bottom surface is attached to a basement membrane. 1 For example, the skin is composed of a layer of epithelial tissue (epidermis) that is supported by a layer of connective tissue. 2  It protects the internal structures of the body from damage and dehydration. 3  Epithelial tissue also helps to protect against microorganisms. Pseudostratified columnar epithelium is a type of tissue that has a single layer of cells arranged in a fashion that appears to be stratified, whereas transitional epithelial tissue is an elastic-like epithelial tissue that swells, contracts, and changes shape as necessary. The Function of Epithelial Tissue. It's good to have the basement membrane on your side, because if there wasn't any, you wouldn't have much epithelial tissue. For example, your body's skin would basically slide right off of you like a glove off your hand. Epithelial Tissue. 1  Epithelial tissue covers the outside of the body and lines organs, vessels (blood and lymph), and cavities. 2  Epithelial cells form the thin layer of cells known as the endothelium, which is continuous with the inner tissue lining of organs such as the brain, lungs, skin, and heart. 1 For example, the skin is composed of a layer of epithelial tissue (epidermis) that is supported by a layer of connective tissue. 2  It protects the internal structures of the body from damage and dehydration. 3  Epithelial tissue also helps to protect against microorganisms. Epithelial tissues, such as the skin, provides a protective barrier from the outside environment. Sweat glands in the epidermis enable sweat to evaporate from the body. The kidneys are made up of epithelial tissue. The liver is made up of epithelial tissue. The epidermis creates a tough, renewable, waterproof barrier that protects human bodies against the environment. Endothelium is a type of epithelium that lines the interior surface of blood vessels and lymphatic vessels, forming an interface between circulating blood or lymph in the lumen and the rest of the vessel wall. It is a thin layer of simple squamous cells called endothelial cells. 
http://www.answers.com/Q/What_is_the_function_of_Epithelial_tissue https://en.wikipedia.org/wiki/Epithelium http://www.wisegeekhealth.com/what-is-the-function-of-epithelial-tissue.htm http://www.wisegeekhealth.com/what-is-the-function-of-epithelial-tissue.htm http://biology.about.com/od/anatomy/a/aa121407a.htm http://study.com/academy/lesson/what-is-epithelial-tissue-function-types-structure.html http://biology.about.com/od/anatomy/a/aa121407a.htm http://www.wisegeekhealth.com/what-is-the-function-of-epithelial-tissue.htm https://en.wikipedia.org/wiki/Endothelium
what is the function of the epithelial tissue