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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
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.
Simple squamous epithelium is present in respiratory tract.
Name one place in living organisms where the following tissues is located:
Squamous epithelium
Name one place in living organisms where the following tissue is located:
Ciliated epithelium
Name the kind of cells found in the following place:
Inner lining of the wind pipe
Name any one body part where ciliated epithelium is found in humans. What is its function?
Lining of small intestine is made up of ______.
State whether true or false. If false, correct the statement.
Epithelial tissue is protective tissue in animal body.
Describe the structure and function of different types of epithelial tissues. Draw diagram of each type of epithelial tissue.
Give reasons for
Meristematic cells have a prominent nucleus and dense cytoplasm but they lack vacuole.
An epithelial layer does not allow the regulation of materials between the body and the external environment.
Glandular epithelium gives a stratified appearance.
Identify the following relationship
Cuboidal: Epithelial
Cardiac: ______
Granulocytes: ______
Osteocytes: ______
Which type of tissue CORRECTLY matches with its location?
Which one of the following types of cell is involved in making of the inner walls of blood vessels?
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.
Match List I with List II.
| List I | List II |
| A. Mast cells | I. Ciliated epithelium |
| B. Inner surface of bronchiole | II. Areolar connective tissue |
| C. Blood | III. Cuboidal epithelium |
| D. Tubular parts of nephron | IV. specialised connective tissue |
Choose the correct answer from the options give below:
