Cardiovascular System

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Across
  1. 1. divides left and right side
  2. 5. between the left atrium and left ventricle of the heart
  3. 6. thick muscular heart tissue
  4. 8. red fluid
  5. 9. layer surrounding/protecting the heart
  6. 13. opposite of the right atrium
  7. 15. heart muscle relaxes
  8. 18. receives deoxygenated blood
  9. 20. opposite of left atrium
  10. 23. innermost layer within the heart
  11. 24. most powerful pumping chamber
  12. 25. paralyzed if damaged
Down
  1. 2. yellow liquid
  2. 3. a one-way valve in the heart
  3. 4. three leaflets
  4. 7. blood system
  5. 10. large cells in the bone marrow
  6. 11. white blood cells
  7. 12. branching blood vessels
  8. 14. controls blood
  9. 16. heart muscles contract
  10. 17. red blood cells
  11. 19. irregular heartbeats
  12. 21. iron-rich protein
  13. 22. blood is carried away