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Across 5. help to clot blood following injury 6. white blood cells; crucial for defense against disease; produced through leukopoeisis 8. erythrocyte formation; begins when myeloid cells are transformed into proerythroblasts, and ends when they become reticulocytes 11. rarest type of whit blood cell 13. the red blood cells that transport oxygen 16. thin, white layer present at the erythrocyte-plasma junction 17. condition in which blood does not clot properly ("Bleeder's disease") 18. Unique to the ABO blood groups is the presence in the plasma of preformed antibodies called 19. oxygen deprivation 20. process that removes unneeded clots after healing

Down 1. condition in which our blood has abnormally low oxygen-carrying capacity (ex. aplastic, sickle cell, and athlete's) 2. life-sustaining fluid that acts as a transport "vehicle" for the organs of the cardiovascular system 3. study of blood 4. stoppage of bleeding 7. blood cell formation; occurs in red bone marrow 9. why our blood is red 10. baby red blood cell 12. refers to group of cancerous conditions involving white blood cells 14. situation of excessive and harmful levels of bacteria or their toxins in the blood; also called blood poisoning. 15. blood clotting; blood is transformed from liquid to gel