Cardiovascular System

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Across
  1. 5. contraction phase of the heart
  2. 7. record of electrical activity of the heart
  3. 10. one of two upper chambers of the heart
  4. 11. smallest type of blood vessel
  5. 12. gas, waste
  6. 13. relaxation phase of heartbeat
  7. 14. the largest artery in the body
  8. 15. artery carrying oxygen-poor blood from the heart to the lungs
  9. 18. double layered membrane surrounding the heart
Down
  1. 1. gas that enters the blood through the lungs
  2. 2. largest vein in the body
  3. 3. the center of a humans circulatory system
  4. 4. valve between the left atrium and left ventricle
  5. 6. pacemaker of the heart
  6. 8. abnormal swishing sound
  7. 9. carries blood away from the heart
  8. 16. inner lining of the heart
  9. 17. beat of the heart