Cell Communication

Question 1

Types of cell communication

Answer 1

Functional classification of junctions
* Occluding junctions
* Anchoring junctions
* Communicating junctions

Question 2

Occluding junctions

Answer 2

Tight junctions -*Main role is to seal cells together to prevent molecules from leaking either to another cell or across a boundary

Question 3

Anchoring junctions

Answer 3

Main role is to mechanically attach cells (and their cytoskeletons) to adjacent cells or to theextracellular matrix.

Question 4

Types of anchoring junctions

Answer 4

Actin filament and Intermediated filament

Question 5

Types of Actin filament anchoring junctions

Answer 5

1. Cell to cell (adherens junction)
   2.cell matrix junction (focal adhesions)

Question 6

Types of intermediate filament anchoring junctions

Answer 6

1.Cell to cell( desmosomes)
2. Cell matrix (hemidesmosomes)

Question 7

Communicating junctions

Answer 7

*Main role is to control the passage of signals (chemical or electrical) from one cell to the other.
*Most cells are linked to their neighbours via gap junctions
*Good examples are cardiac and smooth muscle cells

Question 8

Types of communicating junctions

Answer 8

1. Gap Junctions
2. Chemical Synapes