The Cardiovascular System

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Across
  1. 4. blood that is oxygen-poor
  2. 5. largest vein in the body
  3. 7. innermost lining of blood vessels
  4. 8. abnormal swishing sound caused by improper closure of the heart valves
  5. 9. double-layered membrane surrounding the heart
  6. 10. largest type of blood vessel
  7. 11. small vein
  8. 13. smallest type of blood vessel
  9. 15. relaxation phase of the heartbeat
  10. 16. one of two upper chambers of the heart
Down
  1. 1. instrument to measure blood pressure
  2. 2. contraction phase of the heartbeat
  3. 3. largest artery in the body
  4. 5. one of two lower chambers of the heart
  5. 6. thin-walled vessel that carries blood from body tissues and lungs back to the heart
  6. 10. small artery
  7. 12. muscular middle layer of the heart
  8. 14. inner lining of the heart