Adaptive immunity is specific. Which statement best reflects this?

Prepare for your Anatomy and Physiology II Exam with our comprehensive exam resources. Utilize flashcards, multiple choice questions with hints, and detailed explanations. Boost your readiness for success!

Multiple Choice

Adaptive immunity is specific. Which statement best reflects this?

Adaptive immunity is defined by its specificity. Lymphocytes carry receptors that are each tuned to a particular antigenic determinant, so the response is directed to that exact antigen and not to unrelated ones. When a matching B or T cell encounters its specific antigen, it undergoes clonal expansion and differentiation to produce a tailored attack—antibodies and helper or cytotoxic T cell responses that target that antigen precisely. Memory cells are generated, so future encounters with the same antigen trigger a faster, stronger response. The other statements miss this core idea: targeting many unrelated antigens describes innate immunity, not adaptive; adaptive immunity does involve memory, and it also responds during the first exposure (not just after re-exposure), though the response is slower initially.

Adaptive immunity is defined by its specificity. Lymphocytes carry receptors that are each tuned to a particular antigenic determinant, so the response is directed to that exact antigen and not to unrelated ones. When a matching B or T cell encounters its specific antigen, it undergoes clonal expansion and differentiation to produce a tailored attack—antibodies and helper or cytotoxic T cell responses that target that antigen precisely. Memory cells are generated, so future encounters with the same antigen trigger a faster, stronger response. The other statements miss this core idea: targeting many unrelated antigens describes innate immunity, not adaptive; adaptive immunity does involve memory, and it also responds during the first exposure (not just after re-exposure), though the response is slower initially.

More practice questions