cardiovascular system

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Across
  1. 4. a small artery
  2. 6. this vessel brings blood back to the heart
  3. 8. the valve between the right atrium and right ventricle
  4. 9. blood flows to the heart from the upper part of the body through this vein
  5. 12. this vessel carries blood away from the heart
  6. 13. one of the two lower chambers of the heart
  7. 15. the largest artery in the body
  8. 16. the muscular middle layer of the heart
  9. 17. a partition that separates the chambers of the heart
Down
  1. 1. the valve between the left atrium and left ventricle
  2. 2. this vein brings blood to the heart from the lower part of the body
  3. 3. the inner lining of the heart
  4. 5. a structure that maintains blood flow in only one direction
  5. 7. a small vein
  6. 10. the smallest vessel in the body
  7. 11. the double-layered membrane that surrounds the heart; outer layer of the heart
  8. 14. one of the two upper chambers of the heart
  9. 17. an instrument to measure blood pressure