1. The lymphatic system helps fight infections and diseases. It includes lymph vessels, lymph nodes, the spleen, thymus, tonsils, adenoids, and bone marrow. 2. Lymph nodes filter lymph fluid and trap germs and infected cells. They contain B cells and T cells that help the body fight infections. 3. Vaccines help the immune system learn to recognize and fight specific diseases. They contain weakened or killed forms of germs to trigger antibody production without causing illness.

1. F

2. F
F (lymph) (lymph
vessel) F (lymph node)
F F F F F
F F F F
F F F , F
F F

3. F F
F F F F F F
F

5. F F
F

6. F F ???

7. F
F F F
F F
F F
F F F F
F F F F F
F F

8. (tonsil)
• F 2 F F F
F
F FF F F
F F F F F
F F F F

10. F Thymus gland
• F F F F F F
F F F F
F F F F F
F , F F F

12. F (Spleen)
F F F F
F
F
F
F F
F
F F F
F F F F F

13. F F
F F F
F F

14. F F F
F F F F
F
F F F F
F F
F F
F F F
F

15. F F F
• F F( F
) ( ) F F
F
F
• F F
FF F F F F
F (Antibody) F F
F

16. F F
F F F F
F
- F
- F F F F F
F

17. F (B-cell)
F F F
F
F (plasma cell) F F
F
F (memory cell) F
F F F FF F F
F F F F

18. F (T-cell)
F F F (helper T-cell CD4+) F
F F F F F F
F
F (cytotoxic T-cell CD8+)
F F F F
F F
F F (suppressor T-cell) F
F F F F

19. F F
F F 2
1. F F
2. F

20. F F
F FF F F
F F F F F
F FF F F F F
(vaccine)
F FF F F
F F F FF
4-7 F F F F
F F F .F ..

21. FF F
- F F F F F F
F
- F F
- F F F F
F F F F (toxoid) F
F

22. F
F FF F
F F
F
F F F F FF
F
F F F F F F
F

23. F F
F
(SLE) F F
F (AIDS)

24. F

25. F (AIDS)