Circulatory system

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Across
  1. 1. left side valve
  2. 5. bundle of nerves that control heartbeat
  3. 7. pumps blood out of the heart
  4. 8. Carries blood to the heart
  5. 9. artery that supplies blood to the heart
  6. 11. Valve that allows blood to flow out of heart
Down
  1. 2. expansion and contraction of the arteries
  2. 3. prevents backflow of blood
  3. 4. one cell thick
  4. 6. Carries blood away from the heart
  5. 10. upper chamber of the heart