If the pathogen reappears the body has the ability to immediately produce antibodies to deal with the foreign invader. The Specific defense system circulates in part in the blood and Lymphatic system. The Lymphatic system consists mainly of lymph, lymphatic vessels and structures or organs containing lymphatic tissues. Lymph is a thick colorless fluid. Some of its functions are to carry fat and nutrients and to distribute germ fighting white blood cells.
Lymphatic vessels transport the lymph to the different parts of the body.
Along the larger lymphatic vessels there are small kidney shaped structures that are the lymph nodes. Lymph nodes filter the blood in order to help prevent bacteria and other pathogens from travelling through the lymphatic system. The lymph nodes are areas of high immunological activity along with the bone marrow, thymus, spleen, liver, tonsils, adenoids, appendix, and peyer's patches in the intestines. The human immune system has the ability to recognize and protect against a huge variety of bacteria, viruses and other pathogens that challenge the body daily. All parts of the immune system work together to help protect the human body .