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Question
What is an epithelium? Enumerate the characteristic features of different epithelia.
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Solution
Epithelial tissue is sheet of cells that covers the body surface or lines the body cavity.
- Simple epithelium is single layered.
- Squamous epithelium is made of flattened cells with irregular boundaries.
- Columnar epithelium is made of column like cells with round to oval nuclei at the base.
- Ciliated epithelium has ciilia at the free end.
- Compound epithelium is made of multi-layered cells.
RELATED QUESTIONS
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.
How many types of epithelial tissues have you studied? Write their functions.
Name the tissues found:
in the testes and ovaries.
Answer the following question.
What is cell junction?
Answer the following question.
Describe different types of cell junctions.
Epithelial cells with cilia are found in ______ of our body.
The main function of the cuboidal epithelium is
The ciliated epithelium lines the______.
Write true (T) or false (F)
Epithelial layer is permeable layer.
In a certain type of cell division, the diploid number of chromosomes is reduced to half. This kind of division occurs in ______.
______ epithelium is seen in sweat glands.
Glandular epithelium gives a stratified appearance.
Sieve cells have no companion cells.
Identify the following relationship
Cuboidal: Epithelial
Cardiac: ______
Granulocytes: ______
Osteocytes: ______
Name the different cell junctions found in tissues.
The body of sponges does not possess tissue level of organisation though it is made of thousands of cells. Comment.
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. ______ |
Classify and describe epithelial tissue on the basis of structural modifications of cells.
