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प्रश्न
Describe the structure and functions of epithelium.
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उत्तर
Epithelium is the simplest animal tissue that functions as a protective tissue in the animal body.Epithelial cells are tightly packed and contain very little or no matrix. It covers most of the organs and cavities within the body. It also forms a barrier to keep different body systems separate. The skin and lining of buccal cavity, blood vessels, alveoli, and kidney tubules are made of epithelial tissue. Epithelial cells lie on a delicate non-cellular basement membrane that contains a special form of matrix protein known as collagen.
Epithelium may be simple (composed of a single layer of cells) or stratified (made up of several layers of cells).
Epithelial tissue is classified into following four types depending upon the shape and function of its cells:
(a) Squamous epithelium.
(b) Cuboidal epithelium.
(c) Columnar/glandular epithelium.
(d) Ciliated epithelium.
The main functions of epithelial tissue are as follows:
(i) It forms the outer layer of skin and protects the underlying cells from drying, injury, and chemical effects.
(ii) It forms the lining of mouth and alimentary canal and protects these organs.
(iii) It helps in elimination of waste products.
(iv) It helps in absorption of water and nutrients.
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संबंधित प्रश्न
Identify the type of tissue in the lining of kidney tubule.
Match the items given is column A with those given in column B:
| Column A | Column B |
| (1) Fibrous connective tissue | (a) blood |
| (2) Fluid connective tissue | (b) cartilage |
| (3) Supportive connective tissue | (c) Supportive connective tissue another bone. |
| (4) Ligament | (d) areolar tissue |
| (5) Tendon | (e) connects a muscle with a bone. |
Each of the tissues listed in Column A is related to one of the functions given in Column B. Match the lines correct pairs by drawing
| Column A (Tissue) | Column B (function) |
| (a) Epithelial tissue | i. Movement |
| (b) Connective issue | ii. Protection |
| (c) Vascular tissue | iii. messages |
| (d) Nervous tissue | iv. support |
| (e) Muscular Tissue | v. transport |
Write true or false of the statement. Rewrite the false statement correctly.
Yellow fibrous tissue, a type of connective tissue, is found in ligaments.
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Define the term of the biosphere.
Give four important functions of epithelial tissue. Name one specific place in the body where each function is carried out.
Name the Following : (B) Epithelium Which Lines Lung Alveoli.
Choose the correct option.
________ is a gland which is both exocrine and endocrine.
Match List I with List II.
| List I | List II |
| A. Unicellular glandular epithelium | I. Salivary glands |
| B. Compound epithelium | II. Pancreas |
| C. Multicellular glandular epithelium | III. Goblet cells of alimentary canal |
| D. Endocrine glandular epithelium | IV. Moist surface of buccal cavity |
Choose the correct answer from the options given below:
