Cardiovascular System

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Across
  1. 1. contraction phase of the heartbeat
  2. 4. relaxion phase of the heartbeat
  3. 6. the beat of the heart
  4. 9. double layered membrane surrounding the heart
  5. 10. smallest blood vessel
  6. 14. artery carrying oxygen
  7. 15. record of the electricity flowing through the heart
Down
  1. 2. innermost lining of the blood vessel
  2. 3. partition or wall dividing cavities
  3. 5. inner lining of the heart
  4. 7. valve between the left atrium and the left ventricle
  5. 8. the largest artery in the heart
  6. 11. normal heart sound caused by improper closer of heart valves
  7. 12. one of the two upper chambers of the heart
  8. 13. middle layer of the heart