What type of cells produce immunoglobulins and are precursors to plasma cells?

The correct answer, B lymphocytes, refers to a type of white blood cell that plays a central role in the immune response. B lymphocytes are responsible for the production of immunoglobulins, also known as antibodies. These molecules are critical for identifying and neutralizing pathogens like bacteria and viruses.

When B lymphocytes encounter an antigen, they can undergo a process of activation and differentiation, leading to the formation of plasma cells. Plasma cells are specialized cells that secrete large volumes of immunoglobulins, providing an effective means to target and eliminate the specific antigens that triggered their activation.

The other types of cells listed do not produce immunoglobulins or serve as precursors to plasma cells. T lymphocytes primarily function in cell-mediated immunity and do not produce antibodies. Macrophages are involved in phagocytosis and antigen presentation and do not secrete antibodies. Dendritic cells, while crucial for antigen presentation and initiating the adaptive immune response, also do not produce immunoglobulins. Thus, B lymphocytes are uniquely designed to fulfill the role of antibody production within the immune system.