Cardiovascular System

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Across
  1. 2. small artery
  2. 5. Smallest type of blood vessel
  3. 6. muscular middle layer of the heart
  4. 10. blood blood that is oxygen poor
  5. 12. relaxation of the heartbeat
  6. 14. Upper chamber of the heart
  7. 15. node pace maker of the heart
Down
  1. 1. contraction phase of heartbeat
  2. 3. inner lining of the heart
  3. 4. swishing sound by improper closing of heart valve
  4. 7. Largest artery in the body
  5. 8. small vein
  6. 9. Double layered membrane
  7. 11. cava larges vein in the body
  8. 13. beat of heart felt through walls of artery