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

2. Phagocytosis takes place in:

3. Cytokines are chemical messengers which:

4. The thymus is where T-cell lymphocytes:

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

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

7. Lymphoid organs include the

8. B-cell lymphocytes mature in the:

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

10. One purpose of lymph nodes is to: