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प्रश्न
Give structure, types and functions in brief of the following:
Epithelial tissue
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उत्तर
Epithelial tissue:
Structure: The cells of epithelium are compactly placed, tightly held together and form a continuous sheet. Epithelial cells are supported below on a basement membrane. These cells may be of different shapes and sizes.
Types:
There are two main types of epithelial tissues which are:
(a) Simple and
(b) Compound
Functions:
(i) It forms a protective layer over the body and protects the underlying cells from drying up, injury, germs and harmful chemicals.
(ii) It absorbs water and other nutrients inside the body.
(iii) Some of these cells secrete ear wax, mucus, milk and digestive juices.
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संबंधित प्रश्न
Based on the following information, identify the three types of epithelial tissue in the figures given below :
| a |  |
b |  |
c |  |
(1) Cuboidal epithelium: It consists of a single layer of cuboidal cells.
(2) Columnar epithelium: It is composed of tall, cylindrical cells with oval nuclei usually placed at the base of the cells.
(3) Ciliated epithelium: It consists of cells being hair-like cilia on their free surface.
The following statement is wrong. Rewrite it correctly by changing either one or two words.
Simple squamous epithelium is present in respiratory tract.
The following statement is wrong. Rewrite it correctly by changing either one or two words.
Glandular epithelium is present in kidneys.
State whether true or false. If false, correct the statement.
Epithelial tissue is protective tissue in animal body.
Intestine absorb the digested food materials. What type of epithelial cells are responsible for that?
Write true (T) or false (F)
Epithelial layer does not allow regulation of materials between body and external environment.
An epithelial layer does not allow the regulation of materials between the body and the external environment.
Epithelium founds in the lining of stomach and intestine is
Which one of the following types of cell is involved in making of the inner walls of blood vessels?
Write the appropriate type of tissues in column B according to the functions mentioned in column A.
| Column A | Column B |
| a. Secretion and absorption | i. ______ |
| b. Protective covering | ii. ______ |
| c. Linking and supporting framework | iii. ______ |
