1. Lymphoid organs include the

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

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

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

5. Phagocytosis takes place in:

6. The thymus is where T-cell lymphocytes:

7. Cytokines are chemical messengers which:

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

9. B-cell lymphocytes mature in the:

10. One purpose of lymph nodes is to: