Circulatory system crossword

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Across
  1. 2. the walls of the heart are made up of cardiac ........... (6)
  2. 5. this divides the heart into left and right sides (6)
  3. 7. valves found in veins to prevent back flow (5,6,6)
  4. 11. part of the brain that controls our heart rate (7)
  5. 12. the largest artery in the body (5)
  6. 13. the largest vein in the body (4,4)
  7. 14. word meaning to do with the heart (6)
  8. 17. these blood vessels carry blood away from the heart (8)
  9. 18. these make sure blood only flows in one direction through the heart (6)
Down
  1. 1. when the heart is contracting it is said to be in ........... (7)
  2. 3. the upper chambers of the heart (plueral word) (5)
  3. 4. blood is circulated to the lungs to pick up oxygen in this type of circulation (9)
  4. 5. blood is circulated through all parts of the body in this type of circulation (8)
  5. 6. these tiny blood vessels carry blood through organs (11)
  6. 8. these vessels take blood away from the heart muscle (8,5)
  7. 9. these vessels feed blood and oxygen to the heart muscle (8,8)
  8. 10. the lower chmabers of the heart (pleural word) (10)
  9. 15. these blood vessels carry blood back towards the heart (5)
  10. 16. when the heart is resting it is said to be in ............. (8)