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

2. Phagocytosis takes place in:

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

4. Cytokines are chemical messengers which:

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

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

7. Lymphoid organs include the

8. B-cell lymphocytes mature in the:

9. The thymus is where T-cell lymphocytes:

10. One purpose of lymph nodes is to: