Question

The cell junctions called as tight, adhering and gap junctions are found in
A. Epithelial tissue
B. Neural tissue
C. Muscular tissue
D. Connective tissue.

Answer 1

Hint: Adhering junctions attach the lateral membranes of adjoining epithelial cells. They involve cell-matrix adhesion and are commonly present near the apical surface just bottom of the tight junctions.

Complete answer:
To answer this question, first, we need to know about the tissues where cell junctions are found. In epithelial tissue, at the place, the adjacent cells form ion-rich gap or cell junctions for intercellular communication and chemical exchange. These junctions probably do not provide physical support.
Now, let us find the solution from the option.
In epithelial tissue the plasma membrane of adjoining cells are held together. Four kinds of such junctions are present in vertebrates, they are given below-
Tight junctions block adjoining epithelial cells in a small band just below the apical surface.
Adhesive junctions give hard mechanical attachments among adjoining cells. They keep holding epithelial cells together.
Gap junctions are intercellular channels, which permit the free passage of the ions and the small molecules.

Thus, the correct option is A. i.e. Epithelial tissue.

Note:Epithelial tissue develops the internal surrounding which functions as a protective covering. At tight junctions, the plasma membranes of adjacent cells are closely in association with every other and do not permit any exchange of products. Gap junctions give tiny, reinforced unblocking among adjoining cells, via which ions and tiny molecules can pass through.