MICROANATOMY

Detailed explanation-1: -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-2: -Functionally, gap junctions in animal cells are a lot like plasmodesmata in plant cells: they are channels between neighboring cells that allow for the transport of ions, water, and other substances 3.

Detailed explanation-3: -Tight junctions, or zonula occludens (ZO), are characteristic of epithelial and endothelial cells (Figure 1). Located at the border between apical and lateral membranes, tight junctions regulate the passage of proteins and liquids across the cell monolayer.