Across
- 2. White blood cell that engulfs and destroys pathogens.
- 3. Organ responsible for filtering and trapping antigens.
- 5. Process of introducing harmless antigens to stimulate an immune response.
- 7. Cells that directly attack infected or cancerous cells.
- 8. Substance that triggers an immune response.
- 9. First line of defense against pathogens.
Down
- 1. A type of white blood cell that produces antibodies.
- 4. Type of immunity transferred through breast milk.
- 6. Small proteins secreted by cells to signal immune responses.
- 8. Protein produced by B cells to neutralize pathogens.