| A | B |
|---|
| Lymph tissue | Groups of lymphocytes and other cells which support the lymphocytes |
| Lymph nodes | Encapsulated masses of lymph tissue found along lymph vessels |
| Lymph | Watery liquid formed from interstitial fluid and found in lymph vessels |
| Edema | A buildup of excess of fluid in the tissues, which can lead to swelling |
| Immunological defense | The process by which the body protects itself from pathogenic invaders such as bacteria, fungi, parasites, and foreign substances |
| Diffuse lymphatic tissue | Concentrations of lymphatic tissue with no clear boundaries |
| Lymph nodules | Lymphatic tissue arranged into compact, somewhat spherical structures |
| Innate immunity | An immune response that is the same regardless of the pathogen or toxin encountered |
| Acquired immunity | An immune response targeted at a specific pathogen or toxin |
| Complement | A series of 20 plasma proteins activated by foreign cells or antibodies to those cells. They (1) lyse bacteria, (2) promote phagocytosis, and (3) promote inflammation. |
| Interferon | Proteins secreted by cells infected with a virus. These proteins stimulate nearby cells to produce virus-fighting substances. |
| Pyrogens | Chemicals which promote fever by acting on the hypothalamus |
| Humoral immunity | Immunity which comes from antibodies in blood plasma |
| Cell-mediated immunity | Immunity which comes from the actions of T-lymphocytes |
