Chapter 12

3. cells Antigen presenting cells that help activate adaptive immunity
4. Immune cells in invertebrates that circulate in hemolymph and perform phagocytosis
5. immunity A specific, memory-based immune response found only in vertebrates
9. killer cells Immune cells that destroy infected or cancerous cells lacking normal markers
11. system A group of proteins that enhance the ability to destroy pathogens
14. White blood cells that act as first responders to infection
15. The process of engulfing and digesting foreign substances or pathogens

1. An enzyme that breaks down bacterial cell walls
2. Large phagocytic cells that engulf and digest pathogens
6. immunity A generalized defense that is active immediately upon infection
7. Proteins that interfere with viral replication and activate immune cells
8. response A defense reaction involving redness, swelling, and immune cell activation
10. Agents that have the potential to cause disease
12. Associated Molecular Patterns PAMPs Molecules found on pathogens that are recognized by PRRs
13. Recognition Receptors Receptors on immune cells that recognize common features of pathogens