Adaptive immunity targets specific pathogens with memory via which cells?

Adaptive immunity targets specific pathogens with memory via which cells?

• A. Macrophages only
• B. Erythrocytes
• C. B cells and T cells.
• D. Natural killer cells

Answer: (C)

Adaptive immunity relies on B and T lymphocytes to recognize specific pathogens and to remember them for faster, stronger responses upon re-exposure. B cells respond by making antibodies; some become plasma cells that secrete antibodies, while memory B cells linger to produce a rapid antibody response if the same threat returns. T cells come in two main flavors: helper T cells coordinate the immune response, and cytotoxic T cells kill infected cells. Both types use highly specific receptors generated through gene rearrangement, which lets them target particular pathogens and remember them for future encounters. That lasting, targeted memory is what sets adaptive immunity apart. Macrophages are part of the innate immune system, handling phagocytosis and antigen presentation but not generating lasting, antigen-specific memory. Erythrocytes have no immune memory role. Natural killer cells are also part of innate immunity and don’t provide the same antigen-specific memory as B and T lymphocytes.

Adaptive immunity relies on B and T lymphocytes to recognize specific pathogens and to remember them for faster, stronger responses upon re-exposure. B cells respond by making antibodies; some become plasma cells that secrete antibodies, while memory B cells linger to produce a rapid antibody response if the same threat returns. T cells come in two main flavors: helper T cells coordinate the immune response, and cytotoxic T cells kill infected cells. Both types use highly specific receptors generated through gene rearrangement, which lets them target particular pathogens and remember them for future encounters. That lasting, targeted memory is what sets adaptive immunity apart.

Macrophages are part of the innate immune system, handling phagocytosis and antigen presentation but not generating lasting, antigen-specific memory. Erythrocytes have no immune memory role. Natural killer cells are also part of innate immunity and don’t provide the same antigen-specific memory as B and T lymphocytes.