OSMT (Ontario Society of Medical Technologists) Practice Exam

What do lymphocytes do in response to foreign antigens?

1. Produce antibodies

2. Phagocytosis

3. Trigger inflammation

4. Release histamines

The correct answer is: Produce antibodies

Lymphocytes play a crucial role in the immune response, particularly in recognizing and responding to foreign antigens, which are substances that the immune system identifies as foreign, such as pathogens or infected cells. When lymphocytes encounter these foreign antigens, specifically B cells, they produce antibodies. Antibodies are proteins that specifically target and neutralize foreign invaders, facilitating their removal from the body. The production of antibodies is a key component of the adaptive immune response, allowing for a tailored approach to each unique threat. Additionally, once these antibodies are produced, they can also help activate other components of the immune system, further strengthening the response against the detected antigens. The other answer choices do involve immune responses but are typically associated with different cell types or mechanisms. Phagocytosis is mainly carried out by phagocytes such as macrophages and neutrophils, which engulf and digest foreign particles. Triggering inflammation is a broader response that can be initiated by other immune cells and various signaling molecules, not just lymphocytes. Lastly, the release of histamines is primarily associated with mast cells and basophils and is more relevant to allergic responses and inflammatory processes rather than the direct recognition of foreign antigens by lymphocytes.