Circulatory System Crossword Puzzle by Payne Jungblut

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Across
  1. 1. the ______ separates the two halves of the heart.
  2. 3. ______ is the liquid part of blood.
  3. 6. we breathe this in carbon dioxide comes out.
  4. 7. this organ filters blood.
  5. 9. a fancy word for white blood cells.
  6. 10. the _____ is the most important organ in the circulatory system.
  7. 11. ___ is the color of blood.
  8. 14. _____ are the flaps in the heart.
  9. 15. __________ are the lower parts of the heart.
  10. 17. platelets pile up to form ____s.
Down
  1. 2. ________form clots.
  2. 4. _____ are the top chambers of the heart.
  3. 5. connect veins and arteries.
  4. 8. ________ carry blood from the heart.
  5. 12. the _____ is the largest artery.
  6. 13. _____ is the substance that carries oxygen and nutrients.
  7. 15. _____ carry blood to the heart.
  8. 16. these creatures release chemicals that that keep wounds from being painful.