Advertisements
Advertisements
प्रश्न
How does a gap junction facilitate intercellular communication?
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Distinguish between Simple epithelium and compound 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 tissue is located:
Ciliated epithelium
Name any one body part where ciliated epithelium is found in humans. What is its function?
Epithelial cells with cilia are found in ______ of our body.
State whether true or false. If false, correct the statement.
Epithelial tissue is protective tissue in animal body.
The main function of the cuboidal epithelium is
Write true (T) or false (F)
Epithelial layer is permeable layer.
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.
The ______ epithelium is also known as the pavement membrane.
Glandular epithelium gives a stratified appearance.
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.
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. ______ |
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:
