Across
- 2. immune system cells that recognize invaders
- 3. help develop immunity to disease
- 5. layer of skin
- 9. two types; B-cells & T-cells
- 10. organ where white blood cells mature
Down
- 1. abnormal condition the effects the body
- 4. system that helps fight pathogens & disease
- 6. small hair like structures found in the lungs
- 7. fluid membrane in the throat, nose, and mouth
- 8. like spit