Cardiovascular system

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Across
  1. 2. ensures blood flows in the correct direction
  2. 4. blood enters heart here
  3. 6. force exerted by blood on walls of vessels
  4. 8. made of cardiac muscle
  5. 11. valve that separates left atrium and left ventricle
  6. 12. smallest vessels that bring blood back to the heart
  7. 14. keep heart beating regularly
  8. 15. two leaf valve
Down
  1. 1. only vein that carries blood away from the heart
  2. 2. blood leaves the heart from here
  3. 3. carry blood to the heart
  4. 5. valve that separates right atrium and right ventricle
  5. 7. only artery that carries blood to the heart
  6. 9. take blood away from heart
  7. 10. area where oxygen is exchanged for carbon dioxide
  8. 13. vessel in which blood enters the heart