Tissue Blog 7


Hello Learner,

 In the previous blog, we have discussed animal tissue in brief. I hope you must read about animal tissue given in text book.

 Today, we will be discussing more about them in details

 At the end to today's topic, you will be able to
1. Explain epithelial tissue.
2. Describe different types of epithelial tissue.
3. Tell the location and function of different type of epithelial tissue.
4. Draw diagrams of different type of epithelial tissue.

 So, let us start the topic......

 (A) EPITHELIAL TISSUE
                      https://www.youtube.com/watch?v=c3COBYNC3sQ

Characteristic features
(i)          Epithelial tissue covers most organs and cavities of the body.
(ii)         Epithelial tissue cells are tightly packed in a single or multilayered sheet.
(iii)        They have only a small amount of cementing material between them and almost no intercellular spaces.
(iv)       All the types of epithelial tissues rest on an extracellular fibrous basement membrane.
(v)         The epithelial cells possess the power of division and regeneration.

Various types of epithelial tissues are
                    https://www.youtube.com/watch?v=P3714_a3l0w
    
                 

     1.   Simple Squamous epithelium
(i)          Simple squamous epithelial cells are extremely thin and flat and form a delicate lining.
(ii)         They are arranged like the tiles of a floor.
(iii)        All the cells rest on delicate and non-cellullar basement membrane.

    Simple squamous epithelium tissues are present-
(i)          It is present in lung alveoli, the Bowman’s capsule of nephron in kidney and blood vessels.
(ii)         It is present in oesophagus and lining of the mouth.

  Function: Helps in the exchange of materials across them by simple diffusion.



    
      2.   Cuboidal Epithelium
(i)          It is composed of cubical cells.
(ii)         They have centrally placed rounded nucleus.
(iii)        All the cells rest on delicate and non cellular basement membrane.

Cuboidal epithelium are present-
(i)          Some cell of this epithelium may become specialized as glands, which may secrete substances. These epithelia called glandular epithelia.
(ii)         It is present in renal tubule of nephron in kidney and sweat glands.

Functions: (i) Helps in mechanical support, secretion, absorption and excretion. 

                (ii) Some time, epithelial cells often acquire additional specialization as gland as gland cells, which can secrete substances at the epithelial surface.                    (iii) A portion of the epithelial tissue folds inward, and multicellular gland is formed, this is called glandular epithelium.
    


                            https://www.youtube.com/watch?v=4g3BdKbMC2M

         3.   Columnar Epithelium
(i)          It is composed of elongated cells which are placed side by side like columns.
(ii)         The nucleus of oval shaped and generally placed near the base.
(iii)        All cells rest on delicate and non-cellular basement membrane.
(iv)       Sometimes, hair like projections are present on the outer surface of epithelial cells. This type of epithelium is called ciliated columnar epithelium.

Columnar epithelium is present-
(i)          It is present in lining of alimentary canal, gall bladder and bile duct.

Functions- (i) Helps in absorption and secretion occur, as in the inner ling of the intestine, tall epithelial cells are present.  (ii) In the respiratory tract, the columnar epithelial tissue also has cilia which move and their movement pushed the mucus forward to clear it.
   


    
      4.   Stratified Epithelium
(i)          It is composed of several layers of cells and are arranged in a pattern of layers.
(ii)         The cells of outer layer become flat and hard. These outer layers are called horny layers which are periodically cast off by friction. This is called moulting.
(iii)        The innermost layer rests on basement membrane and called germinative layer.

Stratified epithelium is present-
(i)          It is present the epidermis of skin, mouth, oesophagus and cornea.


Function: Plays a little role in secretion and absorption but provides protection to the underlying tissues.

 Home Assignment
1. Complete the note in your biology notebook.


Comments

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