Across
- 2. to heart
- 5. atrium
- 8. main artery
- 9. tissue
- 10. from heart
- 12. from heart to lungs
- 14. smallest blood vessels
- 15. ventricle
Down
- 1. membrane
- 3. from lungs to heart
- 4. thin and smooth membrane
- 6. colorless
- 7. color
- 11. platelet
- 13. superior/inferior