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प्रश्न
What is an epithelium? Enumerate the characteristic features of different epithelia.
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उत्तर
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.
संबंधित प्रश्न
What is the following and where do you find them in animal body?
Ciliated epithelium
How many types of epithelial tissues have you studied? Write their functions.
Give structure, types and functions in brief of the following:
Epithelial tissue
Answer the following question.
Describe different types of cell junctions.
Lining of small intestine is made up of ______.
Intestine absorb the digested food materials. What type of epithelial cells are responsible for that?
Write true (T) or false (F)
The lining of blood vessels, lung alveoli and kidney tubules are all made up of epithelial tissue.
Write true (T) or false (F)
Epithelial cells have a lot of intercellular spaces.
Differentiate between sclerenchyma and parenchyma tissues. Draw well labelled diagram.
Give reasons for
Meristematic cells have a prominent nucleus and dense cytoplasm but they lack vacuole.
Give reasons for
Intercellular spaces are absent in sclerenchymatous tissues.
______ epithelium is seen in sweat glands.
An epithelial layer does not allow the regulation of materials between the body and the external environment.
Glandular epithelium gives a stratified appearance.
Sieve cells have no companion cells.
Assertion: Materials are exchanged between epithelial and connective tissues by diffusion.
Reason: Blood vessels are absent in epithelial tissue.
Mention the type of epithelium seen in the alveoli of lungs.
Identify the following relationship
Cuboidal: Epithelial
Cardiac: ______
Granulocytes: ______
Osteocytes: ______
Name the different cell junctions found in tissues.
