what organs play important roles in immunity
specific pathogens that are causing disease (B cells produce antibodies against bacteria or viruses in the extracellular. fluid, while T cells kill cells that have become infected). The immune system is closely tied to the lymphatic system, with B and T lymphocytes being found primarily within lymph nodes. Tonsils and the thymus gland are also. considered lymph organs and are involved in immunity. We often don't realize how effective the immune system is. until it fails or malfunctions, such as when the lymphocytes are attacked by HIV in an AIDS patient.