Chapter 12

2. Molecular pattern found on pathogens that is recognized by innate immune receptors
7. Skin, mucous membranes, and secretions that prevent pathogens from entering the body
8. Immune cell that captures and presents antigens to help activate adaptive immunity
12. Immune response to injury or infection involving increased blood flow and immune cell activity
13. Receptor on innate immune cells that recognizes common structures on pathogens
17. White blood cell involved in allergic reactions and defense against parasitic worms
18. Agent that has the potential to cause disease
19. Group of approximately 30 proteins that can help destroy invading microorganisms
20. Chemical released by mast cells that causes blood vessels to dilate and become more permeable

1. Phagocytic white blood cell derived from monocytes and found throughout the body
3. Pathogen-specific defense system that develops immune memory
4. Lymphocyte that destroys virally infected and cancerous cells
5. Enzyme found in tears and saliva that breaks down bacterial cell walls
6. Life-threatening condition caused by an overwhelming inflammatory response
9. Generalized defense system that responds immediately to infection
10. Systemic inflammatory response triggered by substances released from macrophages
11. Process in which immune cells engulf and destroy foreign substances
14. White blood cell that acts as a first responder to infection
15. Signaling protein that regulates immune responses and promotes blood flow to infected tissues
16. Protein that interferes with viral infections and helps activate macrophages