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प्रश्न
Answer the following question.
Describe different types of cell junctions.
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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.
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संबंधित प्रश्न
Name one place in living organisms where the following tissues is located:
Squamous epithelium
Name the tissues found:
at the inner lining of the trachea.
Lining of small intestine is made up of ______.
Some epithelia are pseudostratified. What does this mean?
Intestine absorb the digested food materials. What type of epithelial cells are responsible for that?
Write true (T) or false (F)
The lining of blood vessels, lung alveoli and kidney tubules are all made up of epithelial tissue.
______ epithelium is seen in sweat glands.
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.
How does a gap junction facilitate intercellular communication?
