Thursday, April 20, 2017

Eptithelial Tissue


Epithelial tissue is the covering or protective tissue in animals. It forms the outer covering like skin, outer covering of organs, inner lining of blood vessels, lungs, oesophagus, etc. It protects the body and controls the movement of materials between the body and the surroundings and between the parts of the body. 
   i) Squamous epithelial tissue :- This consists of a layer of thin flat cells. It is     present  in the linings of blood vessels, lungs, mouth, oesophagus etc. 
  ii) Columnar epithelial tissue :-This  consists of tall pillar like cells. It is present in  the walls of the intestine.  Ciliated  columnar epithelial tissue is found in respiratory tract. 
iii) Cuboidal epithelial tissue :-  This consists of cone shape cells having a basement  membrane. It forms the lining of kidney, tubules and ducts of salivary glands  and provide mechanical support. 
iv) Glandular epithelial tissue :- This epithelial tissue folds inwards and  forms a multi-cellular gland which secretes substances. This tissue is called   Glandular epithelial tissue.