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Across 2. White blood cell 4. Prevents backwards flow of blood 5. Area that receives deoxygenated blood from the body (2 Words) 6. Provides oxygen-rich blood to the heart (2 Words) 10. Fluid portion of blood 11. Blood vessel that returns blood back to the heart 12. Smallest blood vessel whose walls are only one cell thick 14. Important fluid connective tissue 15. Portein produced in the body in response to the presence of antigens 17. Blood travels to the lungs in the... (2 Words) 19. takes oxygenated blood to brain and is in the neck (2 Words) 20. All the blood going to the body leaves the... (2 Words) 21. Muscular blood vessel that carries blood away from the heart 22. Responsible for the clotting of blood

Down 1. Rhythmic expansion of artery as a result of heart contractions 3. Red blood cell 4. Body's largest vein (2 Words) 7. These lead to the capillaries in the left and right lungs (2 Words) 8. Number one killer of men and women (2 Words) 9. If cut or damaged, you may die (2 Words) 13. System of vessels carrying lymph, also involved in immunity 16. Body's largest artery 18. The superior Vena Cava leads to the...