Immune System

3. harmless variant or derivative of a pathogen that stimulates a host's immune system to mount defenses against the pathogen
6. cells that develop from B cells and produce antibodies
7. the ability to recognize and remember specific antigens and mount an attack on them
9. a type of cell within the body capable of engulfing and absorbing bacteria and other small cells and particles
10. the short-term immunity that results from the introduction of antibodies from another person or animal
12. proteins (cytokines) secreted by T cells and other cells to aid and regulate the immune response
13. type of lymphocyte that kills infected body cells and cancer cells
15. the body's specific recognition, response, and memory to a pathogen attack
20. cells manufactured in the bone marrow that create antibodies for isolating and destroying invading bacteria and viruses
21. watery fluid within lymphatic vessels
22. having a hypersensitivity to a substance that does not normally cause a reaction.

1. a localized response to an injury or to the destruction of tissues
2. organisms that cause disease
4. the ability of an organism to resist a particular infection or toxin by the action of specific antibodies or sensitized white blood cells
5. activate macrophages, B cells and T cells.
8. immunity that is present before exposure and effective from birth; responds to a broad range of pathogens
11. a form of acquired immunity in which the body produces its own antibodies against disease-causing antigens
14. the two types of white blood cells that are part of the body's immune system
16. produced during a B cell response, but are not involved in antibody producing during the initial infection; are held in reserve for the rest of your life in case you encounter that pathogen again
17. proteins that are produced by B lymphocytes and that attaches to a specific antigen keeping them from harming the body
18. cells created in the thymus that produce substances that attack infected cells in the body
19. recognize pathogens they have encountered before, allowing for a quicker immune response in a second exposure