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

2. One purpose of lymph nodes is to:

3. The thymus is where T-cell lymphocytes:

4. Cytokines are chemical messengers which:

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

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

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

8. Lymphoid organs include the

9. Phagocytosis takes place in:

10. B-cell lymphocytes mature in the: