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Across 5. Organ which recycles hemoglobin and cleans and stores RBCs and platelets 7. Tonsils located at the base of the tongue 8. Cells which develop peripheral proteins to bind with specific antigens during immune response 9. MHC molecule which presents extracellular antigens on an APC 12. System of thin-walled vessels which return extra intercellular fluid to the circulatory system 13. Cell which digests a pathogen and presents its antigens to a T-cell 20. Produce oils which contain fatty acids to hinder bacteria growth 21. Chemical which causes vasodilation by relaxing vascular smooth muscle 23. Lymphocytes that destroy microbes by making contact with them and causing them to leak 24. Organs found along the lymph vessels which are full of cells to filter and destroy foreign substances like bacteria 25. Sets of lymphatic tissues found around the throat region to capture pathogens and destroy foreign substances 27. T-cell which shuts off the immune response when it is finished 29. Proteins produced by viral infected cells to interfere with viral replication 30. Chemical found in saliva and other secretions to break down bacterial cell walls 31. Phagocytic cells which contain histamines as part of the bodies inflammatory response 33. The process of cells ingesting foreign material 34. T-cell which stimulates the proliferation of other T-cells and B-cells 35. Gland which is largest during adolescent and gets smaller with age

Down 1. T-cell which permits a faster response when a pathogen is encountered again in the future 2. Cells which come from activated Bcells 3. First line of defense against infection 4. Body's ability to defend itself against a specific kind of invader 6. MHC molecule which presents intracellular antigens on an APC 9. First cellular line of defense when pathogens enter the body 10. Chemical which stimulates vasodilation and increased blood flow to an area 11. Lining of the body cavities which lubricates the surface and traps foreign particles 14. Tonsils located on the posterior portion of the nasopharynx 15. T-cell which directly attacks and kills other cells 16. Tonsils located behind the roof of the mouth, on either side of the pharynx 17. Chemicals which attract neutrophils from the blood 18. Tonsils located near the eustachian tube 19. Makes tears to lubricate the eyes and wash away foreign particles 22. The process of a phagocyte attaching to a foreign material 26. Movement in response to a chemical gradient 28. Large molecules on the surface of pathogens with stimulate an immune response by T-cells 32. Cells which bind to antigens dissolved in body fluids