The Heart

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