Tight junctions are intercellular adhesion complexes in epithelia and endothelia that control paracellular permeability. This paracellular diffusion barrier is semipermeable: it is size- and charge-selective. Paracellular ion permeability at tight junctions is largely determined by their claudin composition.

What is meant by tight junction?

[ tīt ] n. An intercellular junction between epithelial cells in which the outer layers of the cell membranes fuse, reducing the ability of larger molecules and water to pass between the cells.

What is a tight junction quizlet?

tight junctions. – when 2 cell membranes are held together so tightly that nothing can leak. – proteins in cell membrane form strand that adheres them tightly. – ex) in stomach, bladder, intestines. You just studied 6 terms!