Circulatory System Crossword

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Across
  1. 2. Structures in veins that stop blood from flowing backward
  2. 4. Waste gas carried by blood to the lungs
  3. 6. Substance in red blood cells that carries oxygen
  4. 12. Cell pieces that help blood clot after injuries
  5. 13. Blood cells that fight disease and infection
  6. 15. Process that helps stop bleeding after an injury
  7. 16. Blood ______ a force of blood pushing against blood vessel walls
  8. 18. Blood vessels that carry blood back to the heart
Down
  1. 1. Liquid part of blood that carries nutrients and waste
  2. 3. Fluid that travels through blood vessels
  3. 5. Substances carried in blood that help the body grow and function
  4. 7. Gas carried by blood to body cells
  5. 8. Organs where blood picks up oxygen and releases carbon dioxide
  6. 9. Blood vessels that carry blood away from the heart
  7. 10. Tiny blood vessels where oxygen and carbon dioxide are exchanged
  8. 11. Blood ______, tubes that carry blood throughout the body
  9. 14. Blood cells that carry oxygen
  10. 17. Muscular organ that pumps blood through the body