chapter 21 vocab

2. cells that kill help and suppress
6. protective linnings for the openings in your body
7. unusually high occurance of a disease in a particular place in a certain time period
9. proteins that attach tot he surface of pathogens
12. injections that cause you to be immune to a disease
15. a drug that inhibits or kills bacteria
17. produces antibodies
18. poisons from bacteria
19. small pathogens
20. small organisms
21. network of vessels collects tissue and returns it to your bloodstream
22. large and complex single celled organisms
23. microorganisms and viruses that cause disease

1. white blood cells
3. an infectious disease that has become increasingly common within the last 20 years
4. organisms such as yeast mold and mushrooms
5. substance that is injected
8. second line of defense to pathogens
10. third and most sophistocated line of defense
11. carry out most of the immune systems functions
13. disease caused by viruses in the body
14. single celled microorganisms
16. bodys ability to destroy pathogens