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Across 2. Abnormally high RBC count 4. Produce antibodies or directly attack foreign cells 6. Decreased RBC numbers caused by blood loss 9. Lack of intrinsic factor in stomach reduces availability of vitamin B12 needed for RBC production 10. Combination of oxygen and hemoglobin 11. Medical test in which a centrifuge is used to separate whole blood into formed elements and liquid fraction 15. Decreased RBC numbers caused by destruction of blood-forming elements 17. Produce heparin, which inhibits clotting 18. Structure is disk-shaped without nuclei 19. Lymphocytes and monocytes 22. Tissue-red bone marrow 23. Abnormally low WBC count 24. The condition of part of the clot that dislodges and circulates through the bloodstream 25. Substance that can activate immune system

Down 1. Union of carbon dioxide and hemoglobin 3. Another name for white blood cells 4. Abnormally high WBC count 5. Another name for platelets 7. Neutrophilis, eosinophils, and basophils 8. Inherited defective gene or genes produce an abnormal type of hemoglobin that is less able to carry oxygen 9. Blood minus it's cells 12. Another name for red blood cells 13. Antibodies causing antigens to clump or stick together 14. A normal plasma protein 16. Inability of blood to carry adequate oxygen to tissue 20. Substance made by body in response to stimulation by an antigen 21. Cancer caused by an elevated WBC count