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