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| Epithelial Tissue |
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| Depending upon the shape and function, epithelial tissues are classified into different types. |
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| Here the cells are compact, plate-like with no inter-cellular spaces. It forms the outer layer of the skin and lines cavities and ducts. Its function is to protect underlying parts from germs and injury. |
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| These consist of cube-like cells, which are square in section but the free surface appears hexagonal. Found in kidney tubules and in glands. These tissues provide mechanical strength to the part where they occur and produce secretions. |
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| These consist of cells that are tall and pillar-like. They form the lining of the stomach and intestine. They are also present in the salivary glands, sweat glands and tear glands. These cells give mechanical strength and some that line the intestine adsorb digested food material. |
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| These are cuboidal or columnar cells, the free surface, of which bear cilia capable of beating rhythmically. These cells are found lining the trachea or wind-pipe of vertebrates. The beating cilia help to keep unwanted particles from entering the lungs. |
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| This is actually a modification of the columnar epithelium in which the cells have become specialized for the manufacture and secretion of chemical substances. These cells are found lining the intestine and various glands. They secrete mucus and other secretions. |
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