Lymphatic System

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Author:
Anonymous
ID:
4897
Filename:
Lymphatic System
Updated:
2010-01-23 19:45:56
Tags:
anatomy
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Description:
lymphatic system
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  1. What is the function of lymph nodes?
    filter the lymph fluid that flows through the lymph nodes [the lymphocytes remove potentially harmful bacteria]
  2. Where do T cells mature?
    in the thymus
  3. What are the functions of the spleen?
    • contains numerous macrophages that destroy pathogens as they circulate in the blood that enters the spleen
    • disposes of dead erythrocytes
  4. What are lymphocytes?
    • cells that are produced in the bone marrow
    • several types include: T cells, B cells, and Natural Killer cells
  5. What is the function of Natural Killer cells?
    produce toxic materials that directly kill bacteria by putting holes in them
  6. Where do B cells mature?
    in the bone marrow
  7. What is the bodies' first line of defense?
    nonspecific external barriers such as the skin and mucous membranes
  8. What is the bodies second line of defense?
    nonspecific internal defenses such as: phagocytic and NK cells, fever, and inflammation
  9. What is the bodies last line of defense?
    a specific immune response: cell-mediated immunity or humoral immunity
  10. What are phagocytic cells?
    WBCs that destroy bacteria through phagocytosis
  11. Mast cells release _____.
    histamines
  12. What are neutrophils?
    WBCs that engulf invading microbes
  13. What are Macrophages?
    WBCs that engulf invading microbes and present antigens
  14. What are the two types of B cells and what does each do?
    • plasma cells: offspring of B cells that secrete antibodies into the blood stream
    • memory B cells: offspring of B cells that provide future immunity against invasion by the same antigen
  15. What are the three types of T cells and what does each do?
    • cytotoxic T cells: destroy specific targeted cells
    • helper T cells: stimulate immune responses by both B cells and cytotoxic T cells
    • memory T cells: provide future immunity against invasion of the same antigen
  16. What does humoral immunity target? What type of cell mediates this?
    • invaders outside cells [viruses, bacteria, fungi, toxins, etc.]
    • B cells
  17. What does cell-mediated immunity target? What type of cell mediates this?
    • infected body cells
    • T cells
  18. What are antibodies? What are they made by? Are they specific?
    • protein produced by a host to bind to and inactivate foreign particles
    • B cells
    • yes, they have a unique binding site that allows them to bind to only one antigen

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