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

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

3. One purpose of lymph nodes is to:

4. Phagocytosis takes place in:

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

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

7. Cytokines are chemical messengers which:

8. B-cell lymphocytes mature in the:

9. Lymphoid organs include the

10. The thymus is where T-cell lymphocytes: