Cardiovascular terms

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Across
  1. 4. Relaxation phase of the heartbeat
  2. 7. One of two lower chambers of the heart
  3. 10. largest artery in the body
  4. 12. Record of the electrical activity of the heart
  5. 14. Abnormal swishing sound caused by improper closure of the heart valves
  6. 15. Contraction phase of the heartbeat
Down
  1. 1. Muscular middle layer of the heart
  2. 2. Instrument to measure blood pressure
  3. 3. Double-layered membrane surrounding the heart
  4. 5. small vein
  5. 6. Thin-walled vessel that carries blood from body tissues and lungs back to the heart
  6. 8. Inner lining of the heart
  7. 9. Smallest type of blood vessel
  8. 11. One of two upper chambers of the heart
  9. 13. Beat of the heart as felt through the walls of the arteries.