PRACTICAL no.1: STUDY OF EPITHELIAL TISSUES

 PRACTICAL NO.1
                                              STUDY OF  EPITHELIAL TISSUES
Group of similar cells which performs same function are called TISSUES.There are four types of tissues 
1.EPITHELIAL TISSUE                                       2.CONNECTIVE TISSUE
3.MUSCULAR TISSUE                                        4.NERVOUS TISSUE

EPITHELIAL TISSUES
                                                             Sheets of tightly packed cells are called epithelial tissues.it covers the outside of the body, lining organs, and cavities within the body.
The shape of the cells at free surface of epithelium may be divided into 3 categories

1.CUBIDAL EPITHELIAL TISSUES
Cells like disc as given bellow in figure

     Description:
>simple cubidal cells of epithelium are tightly packed single nucleus cells.
>Location
Kidney tubules , ducts of gland and surface of ovary.
>Function:
Secretion and absorption

2.SIMPLE COLUMNAR  EPITHELIAL TISSUES
Cells in the form of columns.
      Description:
>Simple columnar epithelium cells are single layer of elongated cells.
> Location
Digestive track,Gall bladder, and excretory duct of some glands.
>Function:
Absorption and enzyme secretion.

 3.SIMPLE SQUAMOUS EPITHELIUM CELLS
Are like bricks and floor tiles
      Description:
 These consists of single layer of tightly packed flattened cells with disc shape central nucleus.
> Location
Air sacs of lungs , kidneys glomerulus , lining of the heart and blood vessels.
>Function:
Diffusion and absorption (filtration) of the materials.