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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.
Fill in the blank
Epithelial tissue is made of cells without any ...................... spaces.
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.
Name any one body part where ciliated epithelium is found in humans. What is its function?
Name the tissues found
at the outer layer of skin.
Name the tissues found:
at the inner lining of the trachea.
Answer the following question.
What is cell junction?
The ciliated epithelium lines the______.
Nerve cell does not contain
Give reasons for
Meristematic cells have a prominent nucleus and dense cytoplasm but they lack vacuole.
The ______ epithelium is also known as the pavement membrane.
An epithelial layer does not allow the regulation of materials between the body and the external environment.
Glandular epithelium gives a stratified appearance.
Mention the type of epithelium seen in the alveoli of lungs.
Which type of tissue CORRECTLY matches with its location?
Name the different cell junctions found in tissues.
How does a gap junction facilitate intercellular communication?
Classify and describe epithelial tissue on the basis of structural modifications of cells.
