Which one of the following is NOT a function of epithelial tissue?

Epithelial tissue serves several essential functions in the body, primarily involving the maintenance of boundaries and protection. It is responsible for protection as it covers body surfaces, both internally and externally, creating a barrier against mechanical injury, pathogens, and chemical damage.

Additionally, epithelial tissue plays a significant role in secretion and absorption. For instance, glandular epithelium produces and releases various substances such as sweat, saliva, and hormones, while other types of epithelial cells (like those in the intestines) are specialized for the absorption of nutrients and water.

Contraction, however, is not a function of epithelial tissue. Instead, contraction is primarily associated with muscle tissue, where specialized cells can contract and facilitate movement. Therefore, within the context of epithelial tissue functions, contraction does not fit, making it the correct identification for the function that does not belong.