Immunology

5. Leukocytes that kill pathogens by engulfing and disposing of them
7. Serves as a shield that protects the body from invading pathogens
9. The study of the immune system
10. Leukocytes that kill infected cells, direct other leukocytes into battle, and secrete germ-killing antibodies into the lymph and bloodstream
11. White blood cells
12. Secrete germ-killing antibiotics into the alveoli
13. Name of tissue fluid after it enters the lymph capillaries
14. Fluid found in tissues that surrounds cells and helps them maintain a proper water balance
16. Weapons used by your body to fight off infection
19. Chemical "alarm system" released by leukocytes
20. Contains harmless bacteria which prevents harmful bacteria, yeasts, and pathogens from taking up residence

1. Organisms that cause disease
2. Has no role in fighting infections, but very important to the body's immune system
3. Group of lymphatic tissue located in the small intestine
4. Body's largest lymph node
6. Small, bean-shaped organs where the lymph passes through
8. When histamine is released and capillaries become larger to allow more blood to reach the infected area
15. Elevated body temperature
17. Produces white blood cells
18. produces hydrochloric acid and enzymes that destroy bacteria