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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 |