Advertisements
Advertisements
प्रश्न
Answer the following question.
Describe different types of cell junctions.
Advertisements
उत्तर
The different types of cell junctions are as follows:
- Gap Junctions (GJs):
These are intercellular connections that allow the passage of ions and small molecules between cells as well as the exchange of chemical messages between cells. - Adherens Junctions (AJs):
They are involved in various signalling pathways and transcriptional regulations. - Desmosomes (Ds):
They provide mechanical strength to epithelial tissue, cardiac muscles and meninges. - Hemidesmosomes (HDs):
They allow the cells to strongly adhere to the underlying basement membrane. These junctions help maintain tissue homeostasis by signalling. - Tight junctions (TJs):
These junctions maintain cell polarity, prevent lateral diffusion of proteins and ions.
APPEARS IN
संबंधित प्रश्न
Distinguish between Simple epithelium and compound epithelium
Prevention of substances from leaking across the tissue is provided by ______.
Intestine absorb the digested food materials. What type of epithelial cells are responsible for that?
Fats are stored in human body as
The dead element present in the phloem is
If a potted plant is covered with a glass jar, water vapours appear on the wall of glass jar. Explain why?
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.
An epithelial layer does not allow the regulation of materials between the body and the external environment.
Classify and describe epithelial tissue on the basis of structural modifications of cells.
