B lymphocytes __________.

• A. attack cells that have been infected by viruses
• B. engulf and destroy bacteria and viruses
• C. stimulate other lymphocytes
• D. produce cytokines
• E. multiply and make antibodies that circulate in blood and lymph

Answer: (E)

Verified step by step guidance

1. Understand the role of B lymphocytes in the immune system. B lymphocytes, also known as B cells, are a type of white blood cell that plays a crucial role in the humoral immune response.
2. Recognize that B lymphocytes are responsible for producing antibodies. Antibodies are proteins that specifically recognize and bind to antigens, which are foreign substances such as bacteria and viruses.
3. Note that B lymphocytes do not directly attack infected cells or engulf pathogens. Instead, they produce antibodies that neutralize or mark pathogens for destruction by other immune cells.
4. Understand that B lymphocytes can differentiate into plasma cells, which are the cells that actually produce and secrete antibodies into the bloodstream and lymphatic system.
5. Remember that while B lymphocytes do not produce cytokines or directly stimulate other lymphocytes, the antibodies they produce are essential for the immune system to effectively target and eliminate pathogens.