The Heart

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Across
  1. 5. oxygen-poor blood to lungs
  2. 6. lower right chamber
  3. 7. oxygen poor blood to atrium
  4. 9. prevents back-flow from artery
  5. 11. oxyen-rich blood from lungs
  6. 12. biggest artery
  7. 13. prevents back-flow of blood from ventricle
Down
  1. 1. upper right chamber
  2. 2. muscle wall between heart
  3. 3. left lower chamber
  4. 4. blood to upper body
  5. 8. prevents blood back-flow between ventricle and atrium
  6. 10. upper left chamber