Final answer:
Tight junctions in animal cells are formed by proteins called claudins and occludins, creating a watertight seal that prevents leakage of materials between cells. They are commonly found in epithelial tissues and help maintain tissue integrity and selective permeability.
Step-by-step explanation:
Tight junctions are specialized junctions between adjacent animal cells that create a watertight seal. They are formed by proteins called claudins and occludins. These proteins hold the cells tightly together, preventing the leakage of materials between the cells.
Tight junctions are typically found in epithelial tissues that line internal organs and cavities, such as the skin and the urinary bladder. They play a crucial role in maintaining the integrity and selective permeability of these tissues.