Cardio System

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Across
  1. 2. carries blood from the body into the heart
  2. 3. largest blood vessel
  3. 5. in the veins that closes an opening so that blood flows in one direction
  4. 6. beat of the heart
  5. 9. cells need this to function
  6. 11. divides the right and left ventricles
  7. 13. small artery
  8. 15. this surrounds the heart
  9. 16. blood that is poor in oxygen
Down
  1. 1. the two lower chambers of the heart are called
  2. 4. smallest blood vessel
  3. 7. small vein
  4. 8. middle layer of the heart
  5. 10. is breathed out
  6. 12. largest vein in the body
  7. 14. the two upper chambers of the heart are called
  8. 17. largest artery