Which cells directly bind antigens found in lymph and plasma?

Which cells directly bind antigens found in lymph and plasma?

• A. Helper T cells
• B. B cells
• C. Memory T cells
• D. NK cells

Answer: (B)

B cells are the cells that directly bind antigens found in lymph and plasma. They are a type of lymphocyte that plays a critical role in the adaptive immune response. B cells have specific receptors on their surface, known as B cell receptors (BCRs), which can recognize and bind to specific antigens. When they encounter an antigen that fits their BCR, they can become activated. Once activated, B cells can differentiate into plasma cells that produce antibodies, which are proteins that neutralize or mark antigens for destruction.

This direct binding to antigens allows B cells to initiate a robust immune response, including the production of antibodies that protect against future infections by the same pathogen. The ability of B cells to recognize free-floating antigens in the lymph and plasma is essential for the adaptive immune system's ability to combat infections.