| A | B |
|---|
| Purpose of immune system | repel disease-causing organisms, remove dead/damaged cells, destroy defective cells |
| non-infectious diseases | not caused by microorganisms (bacteria, virus) ex. cancer, diabetes |
| infectious diseases | transmitted by disease-causing microorganisms (bacteria,virus), can be contagious |
| immunity | resistance to disease-causing organism or harmful substance |
| active immunity | body produces necessary antibodies due to previous vaccine or exposure |
| passive immunity | antibodies from source other than yourself (ex. mother to baby) |
| vaccines are effective because: | weakened/dead viruses help you make antibodies/can make them if they see virus again later |
| booster shot | vaccine (shot) increasing antibodies in body |
| 1st line of defense | skin, mucus, cilia, saliva; cough, sneeze, tears, sweat, stomach acid |
| respiratory system | defended by mucus and cilia; |
| 2nd line of defense | when body finds organism, blood rushes to area, wbc attack organisms |
| antibodies | proteins made by immune system; destroy invaders, 3rd line of offense |
| antigens | invading organism or substance that triggers action of antibody |
| shape of antibody | changes from T to Y; arms attach to antigen |
| B and T cells | special white blood cells, T cells alert B cells to make antibodies |
| cancer | disease where cells multiply uncontrollably and destroy healthy tissue |
| AIDS | disease caused by a virus that attacks and hides in helper T cells |
| helper T cells | signal presence of disease-causing organisms; immune system doesn't work without these |
| allergies | when immune system is sensitive to certain substances |
| allergens | substances that cause allergic reactions (dust, feathers, animal hair/dander, foods, pollen) |
| diabetes mellitus | when body makes too little insulin or not able to use insulin that is made |
