We've Got Heart!

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Across
  1. 3. largest single artery in the body
  2. 9. two upper chambers of the heart
  3. 10. carry blood away from the heart
  4. 12. valve between right atrium and right ventricle
  5. 13. endotheliumderived relaxing factor
  6. 14. middle muscular layer of heart muscle
  7. 16. prevent the backflow of blood
Down
  1. 1. four partitions that separate the heart
  2. 2. smooth layer of epithelial cells lining interior of heart and heart valves
  3. 4. oxygen-rich
  4. 5. two lower chambers of the heart
  5. 6. artery leading from heart to lungs
  6. 7. carry blood toward the heart
  7. 8. valve between left atrium and left ventricle
  8. 11. smaller branches of arteries
  9. 15. arteries that supply blood to head and neck