parts of the circulatory system

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Across
  1. 1. part of the heart that sets its pace for beating
  2. 4. low-pressure chambers in the heart
  3. 6. carries blood back to the heart
  4. 8. tissue separates the right and left sides of the heart
  5. 9. aorta for veins
  6. 11. high-pressure chambers in the heart
Down
  1. 2. carries blood to the organs
  2. 3. a type of muscle that helps the heart contract
  3. 5. tiny arteries that bring blood to the organ
  4. 7. controls blood flow in the heart chambers
  5. 10. the main artery leaving the heart