Structures and cytoplasm of adjoining cells are joined .
There are three types of cell junctions in animal cell,
1. Tight junction
2. Gap junction / Communication junction
3. Anchor junction / Desmosomes
1. Tight junction
Connect the plasma membrane of adjacent cells tightly.
ex; epithelial cells of gut
In tight junction inter cellular spaces are reduce.
Function; Prevent the leakage through inter cellular space
2. Gap junction / Communication junction
Allow signals and materials exchange between adjacent cells through direct connections.
There is a structure called canneoxen join the adjacent cells.
Those are tubular structures and composed of proteins.
Inter cellular spaces are hi.
Amino acids and glucose molecule can exchange through connections.
3. Anchor junction / Desmosomes
Cytoskelitan of two cells connect together.
cadherin protein is involved in formation of this junction.