The Heart

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