Epithelial tissue
EPITHELIAL TISSUES
- It consists of cells which form membranes.
- This membrane covers the body surface and the glands.
- The covering or protective tissues in the animal body are epithelial tissues.
- Epithelium covers most organs and cavities within the body.
- It also forms a barrier to keep different body systems separate.
- The skin, the lining of the mouth, the lining of blood vessels, lung alveoli and kidney tubules are all made of epithelial tissue.
- The cells are tightly packed and form a continuous sheet.
- They have only a small amount of cementing material between them and almost no intercellular spaces.
- These are divided into four types:-
SIMPLE
- The cells are extremely thin and flat and form a delicate lining.
- The lining of oesophagus and the mouth are covered with squamous epithelium.
STRATIFIED
- The 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
- The skin, which protects the body, is made of squamous epithelium.
COLUMNAR
- The columnar (meaning ‘pillar-like’) epithelium facilitates movement across the epithelial barrier.
- It is present where absorption and secretion occur, as in the inner lining of the intestine, tall epithelial cells are present.
- 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 epithelium is thus ciliated columnar epithelium.
CUBOIDAL
- Cuboidal epithelium (with cube-shaped cells) forms the lining of kidney tubules and ducts of salivary glands, where it provides mechanical support.
- Epithelial cells often acquire additional specialisation as gland cells, which can secrete substances at the epithelial surface.
- Sometimes a portion of the epithelial tissue folds inward and a multicellular gland is formed.
- This is glandular epithelium.
- Sometimes epithelial tissue takes special function of secretion the it is called glandukar epithelial
- Tissue e.g. sweat gland oil gland etc.l
- Quiz time
- Name the following
- Epithelial tissue present in
- Cheek inner lining---------
- Blood vessels lining ----------
- Small intestine-----------
- Trachea-------
- Sweat gland--------
- Skin----------
- Help box-------Glandular epithelial tissue ,Ciliated columnar epithelial tissue ,
- Columnar Epithelial tissue ,Squamous ET ,Stratified Squamous ET,cuboidal ET
Name the following
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Thank you ma'am
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Mam thank you for these fruitful videos...
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Ma'am i hv completed epithelial tissues....and uploaded on your mail id...
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