1. B-cell lymphocytes mature in the:

2. Cytokines are chemical messengers which:

3. Phagocytosis takes place in:

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

5. The thymus is where T-cell lymphocytes:

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

7. Lymphoid organs include the

8. One purpose of lymph nodes is to:

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

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