Lymphatic System

2. Filter lymph; trap pathogens and foreign particles.
4. Filters blood, removes old red blood cells, and helps fight infection.
7. Microorganisms like bacteria, viruses, and fungi that can cause disease.
9. Fluid that contains white blood cells; helps transport waste and immune cells.
10. Engulf and destroy bacteria and cellular debris.
13. Drains lymph from the upper right side of the body into the right subclavian vein.
15. Vessels Network of tubes that carry lymph throughout the body.
16. Proteins that bind to antigens and mark them for destruction.
17. Produce antibodies to attack specific antigens.
18. The body's ability to resist or eliminate harmful pathogens.
20. Trap and destroy pathogens entering through the mouth and throat.
21. Substances that the immune system recognizes as foreign.

1. White blood cells (T-cells and B-cells) that fight infection.
3. Swelling caused by excess fluid in tissues when lymph drainage is blocked.
5. Large lymphatic sac that receives lymph from the lower body.
6. Produces lymphocytes (B-cells and T-cells).
8. Fluid that surrounds tissue cells; becomes lymph when it enters lymph vessels.
11. Swelling caused by blocked or sluggish lymph drainage.
12. Site where T-cells mature (especially active during childhood).
14. Largest lymphatic vessel; drains lymph from the lower body and left side.
19. Destroy infected or cancerous cells and coordinate immune response.