GENERAL HISTOLOGY

Detailed explanation-1: -Tight junctions bind cells together, prevent molecules from passing in between the cells, and also help to maintain the polarity of cells. They are only found in vertebrates, animals with a backbone and skeleton; invertebrates have septate junctions instead.

Detailed explanation-2: -Occluding junctions seal cells together in an epithelium in a way that prevents even small molecules from leaking from one side of the sheet to the other.

Detailed explanation-3: -By forming a meshwork of membrane contacts around the cell, tight junctions demarcate the apical region from the basolateral region, thereby serving as a physical barrier within the membrane and contributing to the establishment of cell polarity.

Detailed explanation-4: -Occluding junctions The borders of two cells are fused together, often around the whole perimeter of each cell, forming a continuous belt like junction known as a tight junction or zonula occludens (zonula = latin for belt).

Detailed explanation-5: -Cell junctions There are many different ways that cells can connect to each other. The three main ways for cells to connect with each other are: gap junctions, tight junctions, and desmosomes. These types of junctions have different purposes, and are found in different places.