IMMUNOLOGY

Detailed explanation-1: -B cells: These lymphocytes arise in the bone marrow and differentiate into plasma cells which in turn produce immunoglobulins (antibodies). E. Cytotoxic T cells: These lymphocytes mature in the thymus and are responsible for killing cells infected with viruses.

Detailed explanation-2: -T cells and B cells derive their names from the organs in which they develop. T cells develop in the thymus, and B cells, in mammals, develop in the bone marrow in adults or the liver in fetuses.

Detailed explanation-3: -CD8+ T cells (Cytotoxic T Cells), called “killer” cells, directly kill virus-infected and cancerous cells and use small signaling proteins called cytokines to recruit other cells when neutralizing these foreign threats. Regulatory T cells are another class of T cells.

Detailed explanation-4: -There are two major classes of lymphocytes involved with specific defenses: B cells and T cells. Immature T cells are produced in the bone marrow, but they subsequently migrate to the thymus, where they mature and develop the ability to recognize specific antigens. T cells are responsible for cell-mediated immunity.