Across
- 4. blood that is oxygen-poor
- 5. largest vein in the body
- 7. innermost lining of blood vessels
- 8. abnormal swishing sound caused by improper closure of the heart valves
- 9. double-layered membrane surrounding the heart
- 10. largest type of blood vessel
- 11. small vein
- 13. smallest type of blood vessel
- 15. relaxation phase of the heartbeat
- 16. one of two upper chambers of the heart
Down
- 1. instrument to measure blood pressure
- 2. contraction phase of the heartbeat
- 3. largest artery in the body
- 5. one of two lower chambers of the heart
- 6. thin-walled vessel that carries blood from body tissues and lungs back to the heart
- 10. small artery
- 12. muscular middle layer of the heart
- 14. inner lining of the heart