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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
Write the name of the following tissue.
Tissue lining the inner surface of the mouth.
How many types of epithelial tissues have you studied? Write their functions.
Lining of small intestine is made up of ______.
Write true (T) or false (F)
Epithelial layer does not allow regulation of materials between body and external environment.
Describe the structure and function of different types of epithelial tissues. Draw diagram of each type of epithelial tissue.
Give reasons for
Meristematic cells have a prominent nucleus and dense cytoplasm but they lack vacuole.
In a certain type of cell division, the diploid number of chromosomes is reduced to half. This kind of division occurs in ______.
Identify the types of cell junctions that help to stop the leakage of the substances across tissue and facilitation of communication with neighbouring cells via rapid transfer of ions and molecules.
How does a gap junction facilitate intercellular communication?
Match List I with List II.
| List I | List II |
| A. Mast cells | I. Ciliated epithelium |
| B. Inner surface of bronchiole | II. Areolar connective tissue |
| C. Blood | III. Cuboidal epithelium |
| D. Tubular parts of nephron | IV. specialised connective tissue |
Choose the correct answer from the options give below:
