Which immune system is non-specific in its response?

• A. Innate immune system
• B. Adaptive immune system
• C. Both systems
• D. Neither system

Answer: (A)

The main idea is that some parts of the immune system respond in a broad, non-specific way to many different invaders. The innate immune system provides immediate, general defenses such as physical barriers (skin and mucous membranes), chemical defenses (antimicrobial peptides), phagocytic cells like neutrophils and macrophages, natural killer cells, and the complement system. These mechanisms recognize common features of pathogens through pattern recognition receptors and act quickly, but they don’t tailor the response to a particular microbe or develop memory after exposure.

In contrast, the adaptive immune system is specific and targeted. It uses B and T cells to recognize unique antigens, produces antibodies with high specificity, and develops immunological memory so future encounters with the same pathogen are handled more efficiently.

So the non-specific, rapid, broadly acting responses belong to the innate immune system.