What is the main function of lymph nodes in the immune system?

Lymph nodes play a critical role in the immune system primarily by accumulating and sharing information regarding immune responses. They serve as key sites where immune cells, particularly lymphocytes, can interact with one another and with foreign antigens, such as bacteria and viruses. When pathogens enter the body, they are often transported via lymph fluid to the lymph nodes, where they can be recognized by immune cells.

Inside the lymph nodes, T cells and B cells become activated in response to the antigens they encounter. This communication and activation process is essential for launching a coordinated immune response. By facilitating the exchange of immune information, lymph nodes help the body mount a stronger defense against infections.

In contrast, the other options highlight functions that, while important in other contexts, do not accurately describe the main function of lymph nodes. The production of red blood cells typically occurs in the bone marrow, not in lymph nodes. While lymph nodes may produce some antibodies through activated B cells, they are not primarily responsible for the storage of antibodies, which are present throughout the body in various forms. The filtration of lymph fluid does occur as lymph nodes help to remove pathogens and debris from the lymph, but the central role of information accumulation and sharing in immune responses is a more defining function of these