Which of the following is NOT a function of mucous membranes?

Mucous membranes play several vital roles in the body, particularly in protecting and maintaining the health of various systems. Among these functions, preventing dehydration, trapping pathogens, and protecting against infection are all essential roles of mucous membranes.

The function of maintaining body temperature, however, is not a primary role of mucous membranes. While they do contribute to overall bodily functions, they are not directly involved in the thermoregulation process. Body temperature is primarily managed by other systems, such as the hypothalamus and the skin through mechanisms like sweating and blood flow regulation. Therefore, recognizing that mucous membranes are not responsible for maintaining body temperature clarifies why this option does not belong in the list of their primary functions.