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Different types of epithelial tissues

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https://courses.lumenlearning.com/boundless-ap/chapter/epithelial-tissue/

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https://courses.lumenlearning.com/boundless-ap/chapter/epithelial-tissue/

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Epithelial tissue human biology book page no 26

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Epithelial tissue human biology book page no 26

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Epithelium is a simple and non specialized tissue. It is formed of one or more layers of cells upon all external and internal exposed surfaces of the body and organs. It forms the internal coverings of organs.

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Epithelium is a simple and non specialized tissue. It is formed of one or more layers of cells upon all external and internal exposed surfaces of the body and organs. It forms the internal coverings of organs.

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http://www.expertsmind.com/zoology/epithelial-tissue-homework-assignment-help.aspx

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They form many useful exoskeleton structures like scales, hairs, feathers, claws, nails, etc.
http://www.preservearticles.com/2012042130941/what-are-the-general-features-of-epithelial-tissues-10-features.html

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epithelial tissues help in the exchange of gases in the respiratory tract. They bring about exchange of carbon dioxide and oxygen between blood and air.
http://www.preservearticles.com/2012042130941/what-are-the-general-features-of-epithelial-tissues-10-features.html

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Epithelial tissues cover the surfaces and line the cavities and as such they protect other tissues from mechanical injury, drying up, infection and harmful chemicals
http://www.preservearticles.com/2012042130941/what-are-the-general-features-of-epithelial-tissues-10-features.html

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A main feature of Epithelial tissues are that cells rest upon a membrane called 'basement membrane'. This membrane is composed of glycoprotein, mucopolysaccharide and reticular fibres. All these components are secreted by the cells themselves. This membrane acts as plasma membrane
http://www.expertsmind.com/zoology/epithelial-tissue-homework-assignment-help.aspx

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Cells are placed very close to each other. as the intercellular space is absent or very little the intercellular matrix. Matrix is made up of mainly glycoproteins which are secreted by the cells themselves
http://www.expertsmind.com/zoology/epithelial-tissue-homework-assignment-help.aspx

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Because intercellular space is very little, epithelia is generally not pervaded by nerve fibres and blood or lymph vessels.
http://www.expertsmind.com/zoology/epithelial-tissue-homework-assignment-help.aspx

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Epithelium along with underlying connective tissue layer in various organs form mucous and serous membranes
http://www.expertsmind.com/zoology/epithelial-tissue-homework-assignment-help.aspx

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Cells may bear microvilli, cilia stereocilia or flagella etc. generally in large cavities
http://www.expertsmind.com/zoology/epithelial-tissue-homework-assignment-help.aspx