| A | B |
|---|
| organs of immune system | tonsils, spleen, lymph nodes, thymus gland |
| 1st line of defense | skin and mucous membranes |
| 2nd line of defense | phagocytes, inflammation |
| macrophage | big eating cell |
| cytotoxic T cells | kills virus-infected cells |
| B cells | produce antibodies |
| passive immunity | use of "borrowed" antibodies |
| active immunity | body creates its own antibodies against invader |
| action of histamine | vasodilation, increased permeability of vessels |
| memory cells | allow immune system to mount a speedy secondary response |
| autoimmune diseases | lupus, rheumatoid arthritis |
| antibody | fights foreign antigens |
| B and T cells | lympocytes (WBCs) |
| immune cell which activates both cellular and antibody response | helper T cells |
| pathogens | viruses, bacteria that cause disease |
