Heart = Circle of life

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Across
  1. 2. O2
  2. 5. valve bicuspid valve
  3. 7. inner layer of the heart
  4. 8. upper chamber
  5. 9. opens and closes
  6. 11. lower tip
  7. 13. middle layer of heart
  8. 14. lower chamber
Down
  1. 1. partition or wall
  2. 3. small artery
  3. 4. smallest vessel
  4. 6. gas/waste
  5. 9. Largest vein
  6. 10. inner lining of vessels
  7. 12. beat