What are small organs that filter foreign particles and fight infections in the lymphatic system?

Lymph nodes are small, bean-shaped organs that are part of the lymphatic system, which plays a crucial role in the body's immune response. They are strategically located throughout the body and serve as filtration points for lymph fluid. As lymphatic fluid passes through lymph nodes, they filter out foreign particles, such as bacteria and viruses, and facilitate the production of immune cells like lymphocytes. These immune cells are essential for recognizing and responding to infections.

Each lymph node is associated with the surrounding tissue, allowing it to monitor and filter potential pathogens effectively. When an infection occurs, lymph nodes can become swollen due to an increased number of immune cells being produced and activated, indicating their role in fighting infections. This function is what specifically distinguishes lymph nodes from other organs in the lymphatic system, such as bone marrow, thymus glands, and the spleen, which have different roles in immune response and blood filtration.