Now, when dendritic cells found in the tissue pick up pathogenic antigens, they carry these pathogenic antigens into our lymph nodes. And inside the lymph nodes, we have plasma cells that produce antibodies against these antigens. And these antibodies basically leave the lymph nodes along the other side and eventually, they are dumped into our vein system. And that's how antibodies end up in the cardiovascular system, in the blood vessels of our body. Now, within these lymph nodes, we also have other wide blood cells, such as macrophages that can engulf any type of pathogenic agent that might be present inside our lymph system. And in this manner, our lymphatic system not only drains our tissue and prevents the build up of fluid inside the tissue, but it also filters our blood.