click below
click below
Normal Size Small Size show me how
The Lymphatic System
| Term | Definition |
|---|---|
| Lymphatic Capillaries | vessels where lymph flow begins |
| Lymphatic Vessels | larger continuations of the of capillaries; carry lymph to the heart |
| Lymph Nodes | masses of lymphoid tissue; concentrated in armpits, neck, groin, and abdominal cavity |
| Spleen | filters and removes foreign particles and worn out cells |
| Thymus Gland | soft, bi-lobed structure located in the thoracic cavity; composed of lymphoid tissue |
| Tonsils | located in mouth and throat, composed of lymphoid tissue |
| Red Bone Marrow | site of B-Lymphocytes |
| Components of Immunity | antigens and antibodies |
| Antigens | foreign substances that stimulate an immune response |
| Antibodies | proteins produced by cells that react with antigens |
| Lymphocytes | white blood cells involved in the immune response |
| Immunocompetence | programming of lymphocytes |
| T-cells | undergo development in the thymus gland and then migrate to the lymphoid tissue; bind to specific antigens |
| Killer T-cells | destroy virus infected cells, cancer cells, and foreign cells |
| Helper T-cells | Stimulate the defense activities of other lymphocytes |
| Suppressor T-cells | Slows down and eventually stops the defense mechanisms |
| Memory T-cells | stores information about a specific antigen for the next encounter |
| B Cells | Undergo development in the red bone marrow or Peyer´s patches and then migrate to lymphoid tissue |
| Plasma Cells | synthesize and release antibodies |
| Memory B-Cells | stores information about the specific antigen for the next encounter |
| AIDS | disease caused by HIV; destroys T-Cells |
| Measles | highly communicable disease characterized by fever, general malaise, sneezing, nasal congestion, etc.; caused by virus |
| Mumps | inflammation of the parotid and other salutatory glands |
| Rubella | resembles both scarlet fever and measles; also known as German Measles |
| Tetanus | disease due to the toxin clostidium tetani; may cause lockjaw and muscle and paralysis |