Question

Cells of the immune system responsible for the humoral response to a pathogen include all of the following except.

• A. Memory B cells
• B. Helper T cells
• C. Macrophages
• D. Killer T cells
• E. Plasma B cells

Answer 1

Answer: (D)

Killer T cells

The humoral immune response is mediated by the antibodies secreted by plasma B cells.

A. Memory B cells are formed in secondary immune response as they recognize the specific antigen.

B. Helper T cells stimulate the B cells to secrete antibodies.

C. Macrophages are the cells formed in response to foreign particles or pathogens which are engulfed by them by phagocytosis.

D. Killer T cells are the cytotoxic cells that kill the damaged or infected cells.

E. Plasma B cells are the white blood cells that secrete antibodies.

Hence, killer T cells are not involved in the humoral immune response.

So, the correct answer is 'Killer T cells'.