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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 |