Question

what is epithelial tissue??

Answer 1

Epithelial tissue

Forms the outermost covering of the body, body cavity, and internal organs. It separates different organ systems in the body.

Cells are arranged as tightly- packed continuous sheets, without any intercellular space.

They are found in the surface cells of skin, buccal cavity, blood vessels, alveoli, and kidney tubules.

Different types of epithelial tissues

Based on different shapes of epithelial cells, epithelium can be broadly classified as squamous epithelium, columnar epithelium, and cuboidal epithelium .

(i) Squamous and stratified squamous epithelium

Present as thin, delicate, flat lining.

Present in the lining of the mouth, oesophagus, and skin.

Skin forms a protective covering on the body surface, it often gets damaged. Therefore, it is present in multiple layers. This is called stratified squamous epithelium.



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(ii) Columnar and ciliated columnar epithelium

Columnar epithelial cells are pillar-like cells.

They are present in the inner lining of the intestine and respiratory tract.

Their functions include secretion of mucus and absorption of digested food.

Columnar epithelial cells are often marked by the presence of cilia. Cilia are hair-like projections coming out of cells. Cilia can move freely. This helps the mucus to move forward. These cells are called ciliated columnar epithelium.

(iii) Cuboidal epithelium

Cuboidal epithelium is composed of cube-shaped epithelial cells.



They are present in the lining of kidney tubules and ducts of salivary glands.

Some special cells form the surface of secretory glands and gland cells.

Glandular epithelium is often formed by the inward folding of epithelial tissues

Answer 2

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What is Epithelial Tissue?

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Epithelial Tissue is a thin, protective continuous sheet of cells.

Location:-

It covers a surface of the body and lines of the various body cavities and internal organs including the blood vessels. Examples: The outermost layer of skin and the lining surfaces of the mouth, nose, lungs, stomach, etc.

Shape:-

Epithelial cells may be flat, cuboidal or columnar in shape.

Function:-

The epithelial tissue functions for the protection as a skin, absorption and secretion as in intestine, sensory perception, etc.

Epithelial cells join to perform a common function and form a part of epithelial tissue.

Types of Epithelial tissues:-

➯ Squamous Epithelium

➯ Cuboidal Epithelium

➯ Columnar Epithelium

● Ciliated columnar epithelium

● Glandular epithelium

➯ Stratified Epithelium

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