| A | B |
|---|
| Lymphocytes | Produce antibodies, which act against foreign molecules known as antigens |
| Immune response | An antigen-antibody reaction |
| Active Immunity | Results when antibodies are produced by the body in response to a foreign substance (antigen) in the body |
| Passive Immunity | Develops when an individual receives antibodies from an outside source (medication) |
| Vaccinations | A weakened strand of the virus is used to stimulate the immune system |
| B-cells | Respond to specific antigens by producing antibodies that will bind only to the antigen |
| Memory B-cells | Remain in the body in case you encounter the same invading microorganism again |
| Killer T-cells | Seek and destroy infected body cells with the virus in it |
| Helper T-cells | Assist both B-cells and Killer T-cells |
| Allergic Reactions | Results from the over activity of the immune system to common substances such as dust, mold, pollen, or certain foods |
| Autoimmune Diseases | Results from when the immune system begins to attack normal body tissue |
| AIDS | Develops when the HIV virus destroys the Helper T-cells and the body is no longer able to protect itself from diseases that may attack it |
