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