ANATOMY

Detailed explanation-1: -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-2: -Adjacent intestinal epithelia form tight junctions (TJs) that are essential to the function of the physical intestinal barrier, regulating the paracellular movement of various substances including ions, solutes, and water across the intestinal epithelium.

Detailed explanation-3: -Answer and Explanation: The correct answer is option (c) tight junctions. The epithelial cells of the stomach lining are held by tight junctions to keep digestive fluids such as gastric acids and digestive enzymes from reaching the underlying tissue layers.

Detailed explanation-4: -On top of blocking the movement of molecules and ions around the cell, tight junctions keep the integral proteins from moving to the other side of the membrane (the basolateral side). The second type of junction are called gap junctions and these are the channels that connect adjacent cells together.

Detailed explanation-5: -Tight Junctions are predominately formed through interactions between members of the Claudin family of proteins and other transmembrane components such as occludin, tricellulin and junctional adhesion molecules (JAMs).