Cardiovascular System

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Across
  1. 4. large vein that returns blood to heart
  2. 5. lower chambers of the heart
  3. 7. protects red blood cells
  4. 9. blood vessel from arterioles to venules
  5. 10. clots blood
  6. 11. muscular layer of the heart wall
  7. 13. red disk made that carries oxygen
  8. 14. fluid filled sac that protects the heart
Down
  1. 1. carries oxygen rich blood from lungs to heart
  2. 2. largest artery in the human body
  3. 3. upper chambers of the heart
  4. 4. blood vessel that carries low oxygen blood to heart
  5. 6. smooth membrane that lines inside of heart chambers
  6. 8. carries oxygen poor blood from heart to lungs
  7. 12. blood vessel that carries high oxygen blood to the body