Question

describe epithelial tissue and its function

Answer 1

Epithelium (epi- + thele + -ium) is one of the four basic types of animaltissue, along with connective tissue, muscle tissue and nervous tissue. Epithelial tissues line the cavities and surfaces of blood vessels and organs throughout the body.

In general, epithelial tissues are classified by the number of their layers and by the shape and function of the cells.[1][3][4]

The three principal shapes associated with epithelial cells are—squamous, cuboidal and columnar.

Squamous epithelium has cells that are wider than their height (flat and scale-like).Cuboidal epithelium has cells whose height and width are approximately the same (cube shaped).Columnar epithelium has cells taller than they are wide (column-shaped).

By layer, epithelium is classed as either simple epithelium, only one cell thick (unilayered) or stratified epithelium as stratified squamous epithelium, stratified cuboidal epithelium, and stratified columnar epithelium that are two or more cells thick (multi-layered),[5][6] and both types of layering can be made up of any of the cell shapes.[3] However, when taller simple columnar epithelial cells are viewed in cross section showing several nuclei appearing at different heights, they can be confused with stratified epithelia. This kind of epithelium is therefore described as pseudostratified columnar epithelium.[7]

Transitional epithelium has cells that can change from squamous to cuboidal, depending on the amount of tension on the epithelium.[8]

Answer 2

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Epithelial tissues line the outer surfaces of organs and blood vessels throughout the body, as well as the inner surfaces of cavities in many internal organs. ... Functions of epithelial cells include secretion, selective absorption, protection, transcellular transport, and sensing.


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