Across
- 2. blood to/from all body tissues
- 6. graphic record of heart activity
- 9. cardiac muscle
- 11. outer layer
- 12. network of tubes
- 14. heart function
- 16. anchors valve flaps in their closed position
- 17. heart is the size of this
- 19. high resistance to blood flow
Down
- 1. cardiovascular main function
- 3. receives blood
- 4. events of one heart beat
- 5. pump blood out
- 7. low pressure
- 8. prevent backflow of blood
- 10. pacemaker of the heart
- 13. endothelium lines chambers
- 14. blood to/from lungs
- 15. transport vehicle
- 18. this organ weights less than a pound