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प्रश्न
How does a gap junction facilitate intercellular communication?
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उत्तर
A gap junction facilitates intercellular communication by allowing the small signalling molecules to pass from cell to cell. These are hydrophilic junctions that are made up of two protein cylinders called connexus. The movement of molecules through this channel is controlled by PH and Ca2+ions Concentration.
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संबंधित प्रश्न
What is the following and where do you find them in animal body?
Ciliated epithelium
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.
Glandular epithelium is present in kidneys.
Name one place in living organisms where the following tissues is located:
Squamous 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
Name the tissues found:
in the testes and ovaries.
Lining of small intestine is made up of ______.
The ciliated epithelium lines the______.
The dead element present in the phloem is
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.
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 ______.
Assertion: Materials are exchanged between epithelial and connective tissues by diffusion.
Reason: Blood vessels are absent in epithelial tissue.
Which type of tissue CORRECTLY matches with its location?
Epithelium founds in the lining of stomach and intestine is
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.
