circulatory stuff

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Across
  1. 3. device that helps the heart beat
  2. 6. blood cells / help prevent disease
  3. 9. the hole in the middle of veins and arteries
  4. 12. red pigment in blood
  5. 15. flaps in the heart that prevent backflow of blood.
  6. 16. they carry oxygen around the body
  7. 18. pumps deoxygenated blood to lungs
  8. 19. carries oxygenated blood from the lungs
Down
  1. 1. carries blood to the heart
  2. 2. recieves oxygenated blood from lungs
  3. 4. the main artery
  4. 5. one of the proteins in blood
  5. 7. carries deoxygenated blood to the lungs
  6. 8. part of the heart that recieves deoxygenated blood
  7. 9. pumps oxygenated blood to the body
  8. 10. arteries that have one cell thick walls
  9. 11. liquid part of blood
  10. 13. is carried in red blood cells
  11. 14. / they help blood clot, sealing a wound
  12. 17. carries blood away from the heart