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प्रश्न
Stratified epithelial cells have limited role in secretion. Justify their role in our skin.
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उत्तर
The stratified epithelium is made of more than one layer of cells and thus has a limited role in secretion and absorption. Their main function is to provide protection against chemical and mechanical stresses. They cover the dry surface of the skin.
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संबंधित प्रश्न
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.
Write the name of the following tissue.
Tissue lining the inner surface of the mouth.
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 one place in living organisms where the following tissues is located:
Squamous epithelium
Name the tissues found
at the outer layer of skin.
Name the tissues found:
at the inner lining of the trachea.
Some epithelia are pseudostratified. What does this mean?
What is an epithelium? Enumerate the characteristic features of different epithelia.
Nerve cell does not contain
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Write true (T) or false (F)
Epithelial layer is permeable layer.
Give reasons for
Meristematic cells have a prominent nucleus and dense cytoplasm but they lack vacuole.
Assertion: Materials are exchanged between epithelial and connective tissues by diffusion.
Reason: Blood vessels are absent in epithelial tissue.
Explain simple epithelium and its types.
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.
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.
