1.How are interstitial fluid and lymph similar, and how do they differ?

2.What are the roles of the thymus and the lymph nodes in immunity?

3.Describe the functions of the spleen and tonsils

4. What physical and chemical factors provide protection from disease in the skin and mucous membranes?

5. What internal defenses provide protection against mi- crobes that penetrate the skin and mucous membranes?

6.What are the main signs and symptoms of inflammation?

7. What is the normal function of major histocompatibility complex proteins (self-antigens)?

 8. How do antigens arrive at lymphatic tissues? 9. How do antigen-presenting cells process antigens?

10. What are the functions of helper, cytotoxic, and memory T cells?

11. How do cytotoxic T cells kill their targets?

12. How are cell-mediated and antibody-mediated immune responses similar? How do they differ?

13. What is the difference between the secondary response to an antigen and the primary response?

14. What are the consequences of decreases in the number of T cells and B cells with advancing age?