| A | B |
|---|
| pathogen | an agent that causes a disease |
| mucous membranes | a barrier that lines the respiratory, digestive and reproductive systems to prevent infections - 1st line |
| inflammatory response | a 2nd line of defense that causes swelling and redness to suppress an infection |
| histamines | chemical released by cells to initiate the inflammatory response - 2nd line |
| complement system | a group of proteins that initiates the MAC attack - 2nd line |
| interferon | chemical protein that interfers with the replication of viruses - 2nd line |
| neutrophil | WBC that engulfs bacteria and then uses chemicals to kill the engulfed bacteria - 2nd line |
| macrophage | WBC that ingests pathogen and becomes tagged with antigen to initiate the 3rd line of defense |
| Natural Killer cell | WBC that kills cancer cells and cells infected with viruses - 2nd line |
| Cytotoxic T cell | WBC that attacks cells labeled with antibodies - 3rd line |
| Helper T | activated by tagged macrophages - in turn activates cytotoxic T and B cells - 3rd line |
| antigen | any substance that triggers an immmune reaction - usually a foreign protein |
| plasma cell | converted B cell that is responsible for producing a specific antibody - 3rd line |
| antibody | a defensive protein produced when exposed to antigens - target specific - 3rd line |
| immunity | resistance to a specific disease |
| vaccination/vaccine | a medical procedure that produces an immune response without getting the disease |
| antigen shifting | rapid mutations in a virus |
| autoimmune disease | when the body's immune response attacks its own cells |
| AIDS | the symptoms from an HIV infections |
| HIV | a virus that invades helper T cells using the CD4 receptor resulting in the crash of a person's immune system |
| allergy | an over reaction of an inflammatory response - too many histamines are released |
