Cardiovascular system

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Across
  1. 4. contraction phase of the heartbeat
  2. 6. relaxation phase of the heartbeat
  3. 7. small artery
  4. 10. smallest type of blood vessel
  5. 12. node specialized muscle fibers connecting the atria
  6. 13. dioxide gas released by body cells
  7. 14. of the heart lower tip of the heart
  8. 15. inner lining of the heart
Down
  1. 1. instrument to measure blood pressure
  2. 2. small vein
  3. 3. one of two lower chambers of the heart
  4. 5. muscular middle layer of the heart
  5. 8. node pacemaker of the heart
  6. 9. one of two upper chambers of the heart
  7. 11. largest artery in the body