Across
- 1. Provide an immune response to antigens
- 3. Carried by lymphatic vessels
- 8. Filter lymph before it is returned to the blood
- 9. Engulf and destroy foreign substances
- 11. Provides resistance against acid, alkalis, and bacterial enzymes
- 12. A network of tissues and organs
- 14. Harmful materials that enter lymph vessels
- 16. Lymph enters through it the convex side of the lymph node.
Down
- 2. Propel debris-land from lower respiratory passages.
- 4. Destroy bacteria in the intestine
- 5. Forms blood cells in the fetus
- 6. Lymph exits through it the lymph node.
- 7. Nonspecific defense system
- 10. Specific defense system
- 13. Trap microorganisms in the respiratory and digestive system.
- 15. Acts as a sentinel to protect respiratory and digestive tracts
- 17. Located low in the throat, overlying the heart