Across
- 4. Fill up the blank Major ______ Complex
- 9. Grow rapidly
- 10. When Antibodies clumps multiple pathogens together
- 12. These cells release Antibodies
Down
- 1. This is the third line of defense in the immune system
- 2. These cells stay dormant until they are activated by the same antigen/pathogen
- 3. These cells kill infected cells
- 5. Substances that trigger immune response
- 6. The T cells mature here
- 7. A Y shaped protein that attaches to antigen
- 8. The B cells mature here
- 11. This cell has MHC Class II receptors on its surface