Microbiology Practice Exam

In the immune response, what is the role of lymphocytes?

1. Engulf pathogens

2. Produce antibodies

3. Release cytokines

4. Clot blood

The correct answer is: Produce antibodies

Lymphocytes play a crucial role in the immune response, particularly in the adaptive immune system. Their primary function is to produce antibodies, which are specialized proteins that recognize and neutralize specific pathogens, such as viruses and bacteria. When an antigen enters the body, lymphocytes, particularly B cells, are activated and differentiate into plasma cells. These plasma cells then secrete large quantities of antibodies that bind to the antigen, marking it for destruction and preventing it from causing harm. This antibody production not only neutralizes pathogens directly but also helps in signaling other components of the immune system to respond to the threat more effectively. By helping to maintain immunological memory, lymphocytes ensure that the body can respond more rapidly and efficiently to previously encountered pathogens during subsequent exposures. In contrast, the other options illustrate different functions: engulfing pathogens is primarily the role of phagocytes, such as macrophages; releasing cytokines is associated with signaling molecules that orchestrate the immune response and is involved in the function of lymphocytes but is not their defining role; and clotting blood is not related to lymphocyte function as this task is performed by platelets and other components of the hemostatic system.