Which feature characterizes the structure of epithelial tissues?

Epithelial tissues are characterized by being composed of sheets of closely packed cells. This structure allows epithelial tissues to form protective barriers and surfaces in various organs and systems within the body. The tight junctions and desmosomes that hold the cells closely together contribute to the selective permeability of epithelial tissues, enabling them to regulate what passes between the internal and external environments. This compact arrangement not only provides protection but also facilitates functions such as absorption, secretion, and sensation, depending on the specific type of epithelial tissue and its location in the body.