explain the compound epithelial tissue and its types
Answers
Answer:
Stratified epithelial tissue is formed of several layers of epithelial cells of different shapes representing newly formed and mature cells. The superficial layer grows outward from below. Basement membranes are usually absent. Their main function is to protect underlying structure from mechanical wear and tear.
It is much thicker than simple epithelial tissue. This tissue is composed of several layers of cells of various shapes representing newly formed mature cells. The innermost layers mainly contains columnar cells cubiodal cells which are germinative in nature and as they grow towards surface. They become more flattened and then shed. It is two types: non-keratinized epithelium and keratinized epithelium.
Non-keratinized stratified epithelium- This tissue is formed lower cuboidal cells. It is found on wet surfaces that are subjected to considerable wear and tear and are protected from drying. They are found in lining of mouth cavity, tongue, pharynx, oesophagus and vagina.
Keratinized stratified epithelium- This tissue is found on outer dry surfaces of body like skin, hair claws and nails. The outer surface layer consists of dead epithelial cells. This tissue contains Keratin, a highly insoluble fibrous protein with water-proofing qualities. This epithelium is also resistant to friction and bacterial invasion.
Explanation:
Compound epithelial tissue- This type of tissue consist of two or more layers and acts as a protective layer over the skin.
These tissues are further classified as :-
- Stretchable
- Non-strechable