Which is an area of non-specific immune response?

• A. Humoral immunity
• B. Cell-mediated immunity
• C. Temperature
• D. Skin and mucous membranes

Answer: (D)

Non-specific defenses rely on barriers and general defenses that block a wide range of invaders without needing to recognize a specific pathogen. Skin and mucous membranes serve as the body's first line of defense: the skin provides a tough, physical barrier, while mucous membranes line openings and produce mucus to trap microbes and host antimicrobial substances. These surfaces prevent entry and spread of many pathogens right at the entrance, functioning without prior exposure. In contrast, humoral and cell-mediated immunity are parts of the adaptive, specific immune system that target particular pathogens and require prior exposure to develop tailored responses. Fever or temperature changes are a systemic, nonspecific response that helps fighting infection but they are not an area or barrier like the skin and mucous membranes.