Question

1. what is a natural, nonspecific immune response and the bodys first line of defense against antigens?

passive immunity
inflammation
innate immunity
allergic reaction

Explanation:

• Passive immunity is the transfer of antibodies (e.g., from mother to fetus), not the first - line non - specific defense.
• Inflammation is a part of the innate immune response (a second - line defense in some cases), but it is a response to tissue damage and pathogen invasion rather than the first - line, non - specific, natural immune response.
• Innate immunity is natural (present from birth), non - specific (acts against a wide range of pathogens), and includes physical barriers (e.g., skin, mucous membranes), chemical barriers (e.g., stomach acid), and some cells (e.g., phagocytes), which are the body's first line of defense.
• Allergic reaction is an over - reaction of the immune system to usually harmless substances (allergens), not a first - line, non - specific immune response.

Answer:

innate immunity