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Across 1. encompass T and B cells 4. a gland that is usually only present in children 5. can bind to an antigen with another antigen or interfere with its activity 7. release histamine and heparin 9. passes through lymphatic vessels to blood 11. is a substance that stimulates adaptive immunity 12. ingest more phagocytic particles than neutrophils can 14. release the same chemicals as basophils 15. 'interferes' with the development of viral infection and some types of cancer 16. is associated with red and white pulp 18. produces antibodies 19. is a large composition of lymphatic nodules 21. when white blood cells move from lower chemotactic factor concentration to lower

Down 2. adaptive immunity remembers substances through this 3. release anti-inflammatory chemicals 6. is a substance that makes antigens ready for phagocytosis 8. is subdivided into innate and adaptive 10. is a recognition skill of adaptive immunity 13. has a similar fuction to b cells, but is produced in the thymus 17. connects to large veins 20. is connected in a series to filter lymph