Question

explain different types of tissues with the epithelial tissues​

Answer 1

Answer:

The thinness of the epithelial barrier facilitates these processes. Simple epithelial tissues are generally classified by the shape of their cells. The four major classes of simple epithelium are: 1) simple squamous; 2) simple cuboidal; 3) simple columnar; and 4) pseudostratified

Answer 2

Answer:

#Types of Epithelia#

Simple Epithelium

Compound Epithelium

Gladular Epithelium

Explanation:

A. simple epithelium : It is composed of single layer of cells. It lies the body cavity, ducts, and vessels. Helps in diffusion, absorption, filtration ad secretion of substances. It is divided into three types based on the shape of cells :

• simple squamous epithelium : It has single layer of flat tile like cells with a central oval nucleus. Ex: Endothelium of blood vessels, peritonium, pleura, pericardium-mesothelim, wall of bowman's capsule, lining of alveoli of lungs etc..
• simple cuboidal epithelium : It is made up of single layer of cuboid cells with a central nucleus. Ex: epithelium of pct and dct, etc..
• simple columnar epithelium : Simgle layer of tall cells with nucleus at the base. Mucus secreting goblets may be present. It is of two types :

(i) ciliated columnar epithelium : They have cilia at their free surface. Ex: Fallopian tubules, ventricles of brains, etc..

(ii) non-ciliated columnar epithelium : Columnar cells donot bear cilia. Ex: Lining of stomach and intestine..

B. compound epithelium : more than one layer of cells. Main fuction is to provide protection against chemical and mechanical stress.

(i) stratified keratinized squamous epithelium : covers the dry surface of the skin. Keratin is present in these cells.

(ii) stratified non-keratinized squamous epithelium : covers wet surface such as buccal cavity, pharynx, oesophagus etc,.. Keratin layer is absent

(iii) stratified cuboidal epithelium : forms inner lining of ducts of sweat glands, pancreas..

(iv) transitional epithelium : forms the wall of urinary bladder

C. glandular epithelium : responsible for formation of glands. Based on combination of cells, theya are ::

(i) Uicellular eg: goblet guts of cells and  (ii) Multicellular eg: salivary glands

Based of secretions, they are ::

Exocrine (duct) glands: eg-salivary glands, mammary glands etc,..

Endocrine (ductless) glands: eg-pituitary glands, thyroid glands etc,..

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