Patient Care Technician (PCT) AAH Practice Exam

What type of cells play a significant role in the immune response by forming antibodies?

1. Platelets

2. Granulocytes

3. Lymphocytes

4. Erythrocytes

The correct answer is: Lymphocytes

Lymphocytes are a critical component of the immune system, particularly in the formation of antibodies. These specialized white blood cells include B cells and T cells. B cells are responsible for producing antibodies, which are proteins that specifically recognize and bind to antigens, such as bacteria and viruses, marking them for destruction or neutralization. When B cells encounter a specific antigen, they are activated and begin to proliferate, with some differentiating into plasma cells that secrete large amounts of antibodies. This process is essential for the adaptive immune response, allowing for a targeted defense against pathogens. In contrast, other cell types listed, such as platelets, granulocytes, and erythrocytes, do not have the capability to produce antibodies. Platelets are involved in blood clotting, granulocytes are primarily engaged in the immediate response to infection, and erythrocytes are responsible for oxygen transport. The unique function of lymphocytes in producing antibodies makes them vital in the body's ability to fight off infections and develop immunity.