Advertisements
Advertisements
Question
Answer the following question.
Describe different types of cell junctions.
Advertisements
Solution
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
RELATED QUESTIONS
Fill in the blank
Epithelial tissue is made of cells without any ...................... spaces.
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
Answer the following question.
What is cell junction?
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.
Assertion: Materials are exchanged between epithelial and connective tissues by diffusion.
Reason: Blood vessels are absent in epithelial tissue.
Write one point of difference between
Simple and compound epithelial tissue.
Write the salient features of the compound epithelium.
Name the different cell junctions found in tissues.
