1. Which of the following are characteristics of free macrophages and microphages?

2. The majority of lymph fluid in the body returns to the venous circulation via the

3. Cytokines are chemical messengers which:

4. One purpose of lymph nodes is to:

5. A role of immunoglobulin G (IgG) is to:

6. Phagocytosis takes place in:

7. B-cell lymphocytes mature in the:

8. Which of the following is an example of naturally acquired active immunity?

9. The thymus is where T-cell lymphocytes:

10. Lymphoid organs include the