Across
- 4. prevent backflow
- 6. four
- 8. storage
- 10. lungs
- 12. Aorta
- 14. smallest vessel
- 16. wall
- 17. above
- 19. front
- 20. tip
Down
- 1. heart
- 2. pump blood
- 3. oxygen rich
- 5. fibrous connective
- 7. receive blood
- 9. left side
- 11. muscle
- 13. right side
- 15. below
- 18. oxygen poor