Which component is not associated with humoral immunity?

Which component is not associated with humoral immunity?

• A. Dendritic cells
• B. Cytotoxic T lymphocytes
• C. Antibodies
• D. Natural killer cells

Answer: (B)

Humoral immunity is the antibody-driven defense carried out by B cells and the antibodies they produce in body fluids. Cytotoxic T lymphocytes are key players in cell-mediated immunity, recognizing infected cells via MHC I and inducing their destruction. Because humoral and cell-mediated responses are distinct arms of adaptive immunity, cytotoxic T lymphocytes are not part of the humoral component. Dendritic cells help start the humoral response by presenting antigens to helper T cells and B cells; antibodies are the direct effectors of humoral immunity produced by B cells; natural killer cells belong to the innate immune system and kill infected cells, sometimes collaborating with antibodies but they are not antibody producers. So the component not associated with humoral immunity is the cytotoxic T lymphocytes.

Humoral immunity is the antibody-driven defense carried out by B cells and the antibodies they produce in body fluids. Cytotoxic T lymphocytes are key players in cell-mediated immunity, recognizing infected cells via MHC I and inducing their destruction. Because humoral and cell-mediated responses are distinct arms of adaptive immunity, cytotoxic T lymphocytes are not part of the humoral component. Dendritic cells help start the humoral response by presenting antigens to helper T cells and B cells; antibodies are the direct effectors of humoral immunity produced by B cells; natural killer cells belong to the innate immune system and kill infected cells, sometimes collaborating with antibodies but they are not antibody producers. So the component not associated with humoral immunity is the cytotoxic T lymphocytes.