Describe three types of intercellular junctions.

Intracellular junctions are multiprotein complexes which provide communication between cells. There are few types of cells junctions. One of them is a tight junction. In this type membranes of two contiguous cells join together, to form a barrier and bind cells together, and play a role in the organization of epithelial tissue. Another type of junction is gap junction. Those are intracellular channels which permit ions transfers between cells. Gap junctions are found in heart muscle and intestine. A desmosome is the third junctions type. This is the formation of two contiguous cells, made of protein plaque, which serves as a zone of adhesion between cells.