What is the primary function of epithelial tissue?

Epithelial tissue plays a crucial role in the body primarily through its functions of secretion and protection. This type of tissue is made up of closely packed cells that form protective barriers on body surfaces and internal cavities. For instance, epithelial tissue lines the skin, providing a protective layer against environmental hazards, while also covering organs and body cavities.

In addition to protection, epithelial cells are specialized to secrete various substances. Glandular epithelium, a subtype of epithelial tissue, is responsible for producing and releasing hormones, enzymes, and mucus, which are vital for numerous physiological processes. Thus, the primary functions of epithelial tissue encompass both its protective role and its ability to secrete, emphasizing why this is the correct answer.