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  • Describe the structure and function of different types of epithelial tissues. Draw diagram of each type of epithelial tissue.

Describe the structure and function of different types of epithelial tissues. Draw diagram of each type of epithelial tissue.

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Ans-
Epithelial tissues form the outermost covering in the plant body. It act as a protective tissue. Most organs and cavities present within the body are covered by epithelium. E.g., Skin, lining of the mouth, lining of blood vessels, lung alveoli etc.
The cells of this tissue are tightly packed and form a continuous layer.  They have no intercellular spaces present between them. They are permeable and play an important role in regulating the exchange of materials between the body and the external environment and also between different parts of the body.  All types of epithelial tissue are usually separated from the underlying tissue by an extracellular fibrous basement membrane.

The different types of epithelial tissues are-

Types of epithelial tissues

Simple Squamous 

Stratified Squamous

Columnar

Ciliated Columnar

Cuboidal

Glandular

Structure

They have delicate cell lining and possess a flat thin structure

These cells are arranged in several layers

They are the column-like shape tissues

These tissue have cilia present on them

They are cube-shaped cells which are involved in absorption and secretion.

These are special gland cells that can secrete substances

Present in

Alveoli and bowman’s capsule- nephron in kidney 

Skin 

Intestine 

Respiratory system 

Kidney tubules

Sweat glands in the skin

(1) Simple squamous epithelium
(2) Stratified squamous epithelium
(3) Columnar epithelium
(4) Ciliated columnar
(5) Cuboidal epithelium
(6) Glandular epithelium

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