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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
Distinguish between Simple epithelium and compound epithelium
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.
Glandular epithelium is present in kidneys.
Name one place in living organisms where the following tissue is located:
Ciliated epithelium
Name the tissues found:
in the testes and ovaries.
Answer the following question.
What is cell junction?
Prevention of substances from leaking across the tissue is provided by ______.
The dead element present in the phloem is
Write true (T) or false (F)
Epithelial layer is permeable layer.
Differentiate between sclerenchyma and parenchyma tissues. Draw well labelled diagram.
In a certain type of cell division, the diploid number of chromosomes is reduced to half. This kind of division occurs in ______.
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.
Assertion: Materials are exchanged between epithelial and connective tissues by diffusion.
Reason: Blood vessels are absent in epithelial tissue.
Identify the following relationship
Cuboidal: Epithelial
Cardiac: ______
Granulocytes: ______
Osteocytes: ______
Which type of tissue CORRECTLY matches with its location?
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.
