cardiovascular system

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Across
  1. 2. smallest blood vessel
  2. 3. The middle muscular layer of heart wall
  3. 4. contraction phase of heart beat.
  4. 6. small vein
  5. 7. relaxation phase of heart beat.
  6. 9. inner lining of the heart
  7. 11. largest vein in the body
  8. 12. rhythm normal heart rhythm.
  9. 14. upper change of heart
  10. 15. record used to detect electrical current
Down
  1. 1. valve between left atrium and left ventricle
  2. 5. node the pacemaker of the heart
  3. 8. sac-like membrane surrounding heart
  4. 10. carries oxygen poor blood from the body
  5. 13. carries oxygenated blood away from the heart
  6. 14. blood is pumped out of left ventricle into valve