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They are thin tissue that cover all the exposed surface of the body.

They are thin tissue that cover all the exposed surface of the body. They cover various surfaces of body parts like inner lining of mouth, digestive tract, secretory glands, lining of hollow parts of every organ such as heart, lungs, eyes, the urogenital tract, etc. The cells which form epithelial tissue are closely attached to each other through a structure called tight junctions. They don’t have blood vessels and nerves and also they are supported by connective tissue called the basement membrane. They show polarity with distinct basal domains facing the basement membrane and other apical surfaces of the lumen of an organ or the external environment.

Classification of epithelial tissue  is mainly based on their layers, shape and functioning.

Simple Epithelial/Unilayered Epithelial: Having a single layer. They are in direct contact with basement membranes that separate it from the underlying connective tissue. They are further divided into various types:

They are formed from tightly fitted continuous layers of cells. They are either exposed to the external surface or the body fluid inside the body. There are specialised junctions present between the cells of epithelium. Some of these junction are given below: Tight Junctions: They mainly prevent leakage across the tissue. Adherens Junction: They help in keeping neighbouring tissues properly cemented. Gap Junction: They help in movement of ions and molecules across the tissue. Epithelial Cell Mainly have Two Types of Membrane:

Epithelial cell play major role in various function of body, some of the crucial function are given below:

They are thin tissue that cover all the exposed surface of the body. They cover various surfaces of body parts like inner lining of mouth, digestive tract, secretory glands, lining of hollow parts of every organ such as heart, lungs, eyes, the urogenital tract, etc. The cells which form epithelial tissue are closely attached to each other through a structure called tight junctions.

Epithelial tissue is classified on the basis of shape, layer and function:

Squamous Epithelial Cuboidal Epithelial Columnar Epithelial

Simple Epithelial Stratified Epithelial

Epithelial tissue perform crucial functions, some of their major functions are:

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