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lymph straw colored, similar to plasma lymph vessels parallel veins located in almost all tissues and organs that have a blood supply thoracic duct largest lymph vessel lymph nodes tiny oval shaped- alone or in groups-found in head, neck, axilla, chest, abdomen and groin tonsils get smaller as you age located in throat adenoids tonsils on upper part of throat spleen sac-like mass of lymph tissue located left abdominal cavity, just below diaphragm thymus upper, anterior chest above heart lymph function fluid that goes between capillary blood and tissue carries digested food, O2 and hormones to cells lymph vessel function transport excess tissue fluid back into circulatory system valves prevent backflow lymph flow goes in one direction from organs to heart 2 main lymphatic throacic duct and right lymphatic duct function of lymph nodes produce lymphocytes filter harmful services function of tonsils lymph tissue that produces lymphocytes gets smaller with age function of spleen produce lymphocytes and monocytes filter bood-stores RBC-recycles olf red cells function of thymus produces lymphocytes also considered an endocrine gland function of immunity resist disease natural immunity inherited and permanent at birth unbroken skin, musus and tears, blood phagocytes, local inflammation acquired immunity body's reaction to invaders passive acquired immunity lasts a few weeks from injecting antibiotics active acquired immunity lasts longer natural acquired immunity results of recovering from disease, body manufactures own antibodies artificial acquired immunity from being vaccinated immunization antigen injected into a person to stimulate production of antibodies tonsillitis infected and enlarged tonsils difficulty swallowing adenitis lymphadenitis occures when infection is present and body makes WBC to fight infection Hodgkin's Disease cancer of lymp nodes painless swelling of lymph node treatment: chemotherapy and radiation mononucleosis oral contact virus symptoms: lymphadenitis, fever, fatigue, increase leukocytes treat: bedrest hypersensitivity abnormal response to drug or allergen antibodies made in response to allergen anaphylactic shock severe or fatal allergic reaction antigen-antibody response stimulates massive secretion of histamine allergen antigen that causes allergic response example ragweed, penicillin, bee stings, food anaphylaxis symptoms breathing problems, headache, faceial swelling, drop BP, stomach cramps, vomiting Rx- adrenaline AIDS acquired immunodeficiency syndrome AIDS full disorder ARC AIDS-related complex AIDS incubation 1 to 12 years