Question

What are epithelial tisues?

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Answer 1

Answer:

epithelial tissues are dividing tissue

They are of four type

squamous

cuboidal

cilliated

stratified

Answer 2

HEYA MATE HERE U GO.....

YOUR included answer:)

• the covering or protective tissues in the animal body are epithelial tissue.
• epithelium covers most organs and cavities within the body.
• it also forms the barrier to keep diffrent body system seprate
• the skin, the lining of the mouth, the lining of blood vessels , lungs alveoli and kidney tubules are all made up of epithelial tissue.
• epithelial tissue cella are tightly packed and from a continous sheet.
• they have only a small amount of cementing material between them and almost no intercellular spaces
• obviously, anything enetring or leaving the body must cross at least one layer of epithillium.
• as a result the permeability of the cells of various epithelia play an important role in regulating the exchange of material between the body and the external environment and also between diffrent parts of the body.
• regardless of the diffrent type all epithelium is usually seprated from the underlying tissue by an extracellular fibrous basement membrane.
• diffrent epithelia show differing structures that correlate with their unique functions.
• for example in cells lining blood vessels or lung alveoli where the transportation of substances occures through a selectively permeable surface there is a simple flat kind of epithelium.
• this is called the simple squamous epithelium .
• simple squamous epithelial cells are extremley thin and flat and form a delicate lining. the oesophagus and the lining of the mouth are also covered with squamous epithelium.
• skin epithelial cells are arranged in many layers to prevent wear and tear.
• since they are arranged in a pattern of layers the epithelium is called stratified squamous epithelium.
• where absorption and secretion occure, as in the inner lining of the intestine tall epithelial cells are present.
• this is columnar epithelium facilitates movement across the epithelial barrier
• in the respiratory tract the columnar epithelial tissue also has cilia which are hair like projections on the outer surfaces of epithelial cells
• these cilia can move and their movement pushes the mucus forward to clear it.
• this type of epithilium is thus ciliated columnar epithilum
• cuboidal epitbilum forms the lining of kidney tubules and ducts of salivary glands where it provides mechanical support.
• epithelial cells often acquired additional specalisation as gland cells which can secret the substances at epithelial surface
• sometimes a portion of the epithelial tissue folds inward and a multi cellular gland is formed
• this is glandular epithilum

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