Across
- 5. Structure in veins to keep blood flow one way
- 8. Inner lining of the heart
- 10. Largest artery in the body
- 12. Contraction phase of the heartbeat
- 13. Wall dividing cavity
- 14. Record of electrical activity of the heart
Down
- 1. Double layered membrane lining the heart
- 2. Beat of the heart as felt through the walls of artery
- 3. Relaxation phase of the heartbeat
- 4. Upper chamber of the heart
- 6. Largest vein in the body
- 7. Lower chamber of the heart
- 9. Smallest type of blood vessel
- 11. Abnormal swishing sound caused by improper closing of the heart valve
- 15. Gas that enters the blood through the lungs