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AP MOD.I-Immunity
Lymphatic System and Immunity
Term | Definition |
---|---|
lymphedema | swelling of tissues caused by blockage of lymph vessels |
lymphangitis | inflammation of lymphatic vessels |
elephantiasis | severe lymphedema of limbs fromparasitis infestation |
lymphoma | malignant tumor of lymph nodes |
Hodgkin disease | type of lymphoma characterized by swelling of lymph nodes in neck |
non-Hodgkin lymphoma | type of lymphoma characterized by sweling of lymph nodes |
thymus | produces T lymphocytes (T cells) |
pharyngeal tonsils | adenoids |
palatine tonsils | "the tonsils" |
spleen | largest lymphoid organ responsible for phagocytosis of bacteria and old RBCs |
splenomegaly | enlargement of the spleen |
nonspecific immunity | does not require prior exposure to antigen |
specific immunity | recognizes prior exposure to bacteria and antigens |
acquired immunity | immunity obtained after birth from injection or exposure to agent |
natural immunity | exposure to causitive agent is not deliberate |
active natural immunity | active disease produces immunity |
passive natural immunity | immunity passed from mother to fetus |
artificial immunity | exposure to causitive agent is deliberate |
active artificial immunity | vaccination |
passive artificial immunity | immunity passed from one individual to another |
antibody | protein substance that destroys or inactivates antigens in the body |
phagocytes | injest and destroy foreign substances |
lymphocytes | most numerous immune cells |
B cells | develope into plasma cells, secrete antibodies into blood |
T cells | produce cell-mediated immunity |
hypersensitivity | excessive immune response |
allergy | hypersensitivity to harmless environmental allergens |
autoimmunity | inappropriate, excessive response to self-antigens |
isoimmunity | excessive reaction to antigens from another human |
systemic lupus erythematosus | (SLE)-chronic inflammatory disease caused by antibody attack on tissue |