| A | B |
|---|
| Edema | swelling |
| Lymph | fluid from tissues in lymphatic vessels |
| Lymph Nodes | filter lymph |
| Spleen | filters blood, stores extra blood |
| Tonsils | lymphatic tissue around pharynx |
| Thymus Gland | larger in children,for T cells |
| Red Bone Marrow | lymphocytes made here |
| Immunity | defense against pathogens & tumors |
| Pathogen | harmful bacteria, viruses, etc. |
| Barriers | keep pathogens out |
| Mast cells | basophils in tissues, make histamine |
| Histamine | chemical that dilates capillaries |
| Macrophage | monocytes in tissues, phagocytes |
| Pus | dead cells, bacteria, fluid |
| Natural Killer Cells | kill tumor & virus infected cells |
| Interferon | chemical response that helps prevents virus spread |
| Antigen | immune system reacts, "key" |
| B Lymphocyte | makes antibodies |
| T Lymphocyte | cell-to-cell killing, controls B cells |
| Antibody | Y-shaped protein, "lock" |
| Memory B Cell | remain to fight antigen again |
| Artificial Active Immunity | vaccine |
| Natural Passive Immunity | antibody from mother |
| Allergy | immune response to harmless substance |
