Cardiovascular System

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Across
  1. 3. One of the two upper chambers of the heart
  2. 5. The smallest type of blood vessel
  3. 8. The innermost lining of blood vessels
  4. 9. The relaxation phase of the heartbeat
  5. 12. An abnormal swishing sound caused by improper closure of the heart valves
  6. 14. The beat of the heart as felt through the walls of the arteries
Down
  1. 1. The contraction phase of the heartbeat
  2. 2. The largest artery in the body
  3. 4. The muscular middle layer of the heart
  4. 6. A small artery
  5. 7. The double-layered membrane surrounding the heart
  6. 8. The record of the electrical activity of the heart
  7. 10. The inner lining of the heart
  8. 11. A small vein
  9. 13. The largest type of blood vessel