Across
- 2. contraction phase of the heartbeat
- 3. lower chamber of the heart
- 5. largest artery in the body
- 6. abnormal swishing sound caused by improper closure of heart valves
- 8. relaxation phase of the heartbeat
- 10. inadequate oxygen in the tissues
- 13. small vein
- 14. upper chambers of the heart
- 15. double layered membrane surrounding the heart
Down
- 1. record of the electrical activity of the heart
- 4. inner lining of the heart
- 6. muscular middle layer of the heart
- 7. rapid heartbeat
- 9. gas that enters the blood through the lungs
- 11. largest type of blood vessel
- 12. beats of the heart felt through the walls of the arteries