Across
- 2. heart muscle
- 3. sac- membrane
- 9. Coronary veins
- 10. transfer fresh oxygen
- 11. upper chambers
- 12. small vessels
- 14. white blood cells
- 15. inner layer
Down
- 1. large vein
- 4. red blood cells
- 5. poor oxygen
- 6. lower chambers
- 7. Platelets
- 8. heart wall
- 13. rich oxygen