Chapter 16

2. _____ directly enter the bloodstream.
4. ____ destroy foreign particles and cellular debris.
6. When palatine tonsils become inflamed or enlarged, it is called_____.
8. The walls of lymphatic capillaries form an _____.
12. The act of monitoring body fluids is called ____.
14. Macrophages destroy _____ ____.
15. All lymphocytes originate in the red ____ ____.
18. The main function of lymph nodes is to ___ foreign particles from the lymph.
19. The lymphatic capillaries merge into____.
20. ____ protect the body from pathogens through the digestive tract and respiratory system.

1. Red bone marrow creates _____ ____ cells.
3. Endothelium allows interstitial fluid to enter ____.
5. Lymphocytes of the spleen defend the body against ____.
7. Bone marrow plays a large part in _____.
9. ____ attack viruses and bacteria.
10. _____ prevent throat and lung infections.
11. The spleen is enclosed in ____ ____.
13. As the time of birth approaches, the spleen halts the production of ___ blood cells.
16. When pharyngeal tonsils become enlarged, they are called_____.
17. Once the interstitial fluid is inside lymphatic capillaries, the fluid is called ___.