How do B cells contribute to the immune response?

• A. By activating T cells and macrophages
• B. By producing antibodies that bind to antigens
• C. By engulfing pathogens directly
• D. By releasing cytokines to enhance inflammation

Answer: (B)

B cells play a crucial role in the immune response primarily through their ability to produce antibodies. Antibodies are proteins that specifically bind to antigens, which are substances that can provoke an immune response, such as pathogens like viruses and bacteria. When B cells encounter their corresponding antigen, they become activated, often with the help of T cells, and differentiate into plasma cells. These plasma cells then secrete large quantities of antibodies into the blood and lymphatic system.

The antibodies bind to the antigens of pathogens, which serves several purposes: they can neutralize the pathogen, marking it for destruction by other immune cells, or they can precipitate the formation of immune complexes that facilitate the clearance of pathogens from the body. This antibody-mediated response is a key aspect of the adaptive immune system, allowing for a targeted and effective defense against specific invaders. This is why the production of antibodies that bind to antigens is fundamental to B cell function in the immune response.