Final answer:
Tight junctions are the type of cell junction that prevents movement of solutes between cells in an epithelial layer by forming a watertight seal.
Step-by-step explanation:
The cell junction that prevents the movement of solutes between the cells of an epithelial layer is known as a tight junction. These junctions form a watertight seal between adjacent cells which stops materials from leaking between them. This is critical in maintaining the selective barriers in tissues like those lining internal organs and the skin, where tight junctions prevent unwanted substances from entering the extracellular space.
For example, in the epithelial cells lining the urinary bladder, tight junctions impede urine from leaking into the extracellular space, similarly, they also prevent food particles from leaking between gut cells into the body. Thus, tight junctions are essential in maintaining compartmentalization and integrity in various organs.