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Across 4. These blood cells carry oxygen 6. The liquid part of blood 8. These vessels carry blood away from the heart 9. This type of circulation is linked to the lungs 10. These prevent backflow of blood 14. These are the smallest type of blood vessel 16. The "pipes" that carry blood around the body 17. An organism that can cause disease 18. These blood cells help immunity

Down 1. A special artery that carries blood from the heart to the body 2. A special vein that carries blood back to the heart from the body 3. Red blood cells don't have this 5. Fragments of cells that help to clot blood 7. Blood that has oxygen is said to be... 11. The red pigment that makes red blood cells red 12. Device used to look at blood smears 13. The shape red blood cells have 15. Substance carried by red blood cells 16. These vessels carry blood to the heart