describe the structure and function of various types of epithelial tissue
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Answer:
Epithelial tissue lines the surface of a body and forms a protective covering. Epithelium cells are packed tightly together with little intercellular matrix.
Epithelial tissue in the body is of two types.
(a) Simple epithelium: It consists of a single layer of cells where cells are in direct contact with the basement membrane. It is further sub-divided into the following types:
(i) Simple squamous epithelium: It consists of a single layer of flat cells with irregular boundaries. It is found in the walls of the blood vessels and in the lining of alveoli.
(ii) Simple cuboidal epithelium: It consists of a single layer of cube-like cells. It is present in regions where secretion and absorption of substances takes place such as the proximal convoluted tubule region of the nephron.
(iii) Simple columnar epithelium: It consists of a single layer of tall, slender cells with their nuclei present at the base of the cells. They may bear micro-villi on the free surfaces. Columnar epithelium forms the lining of the stomach and intestines, and is involved in the function of secretion and absorption.
(iv) Ciliated epithelium: It consists of columnar or cuboidal cells with cilia on their free surfaces. They are present in bronchioles and oviducts from where they direct mucus and eggs in specific directions.
(v) Glandular epithelium:It consists of columnar or cuboidal cells involved in the secretion of substances. Glands are of two types, unicellular glands (goblet cells of the alimentary canal) and multicellular glands (salivary glands). They can be classified as exocrine (ductless glands) and endocrine glands (duct glands) by the method through which they release enzymes.

(b)

Compound epithelium: It consists of many layers of cells. It is involved mainly in the function of providing protection and has a limited role in secretion and absorption.
Dry surface of the skin or moist inner lining of the buccal cavity, pharynx, pancreatic ducts, and the inner lining of ducts of salivary glands are some of the examples of compound epithelium
Answer:
Epithelial tissue is the simplest tissue. It is a protective tissue in of animal body.
Its various types are:-
1- Squamous epithelium-
it is made up of 10 flat is regular shaped cells which fit together like floor tiles to form a compact issue. It is also known as pavement epithelium.
2- Cuboidal epithelium-
it helps in absorption secretion and excretion it also helps in mechanical support and found in kidney tubules thyroid vesicles and in glands.
3- Columnar epithelium-
it consists of cell which are taller than broader the nuclei are towards the base and sometimes free ends of cell have brush border containing microvilli. Its main function includes absorption and secretion.
4- Glandular epithelium-
the grandular epithelium is often modified to form glands which secrete chemical.
5- Ciliated epithelium-
it is found in the sperm duct. The ciliated columnar epithelium lines the trachea, bronch, kidney tubules, and ovyducts. The rhythmic concerted beating of cilia move the solid particles in one direction through the ducts.
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Explanation: