Across
- 4. One of two lower chambers of the heart.
- 5. One of two upper chambers of the heart.
- 8. Beat of the heart as felt through the walls of the arteries
- 9. Small artery
- 10. Record of the electrical activity of the heart
- 14. Double-layered membrane surrounding the heart
- 15. Instrument to measure blood pressure
Down
- 1. Smallest type of blood vessel.
- 2. Relaxation phase of the heartbeat.
- 3. Contraction phase of the heartbeat.
- 4. Small vein
- 6. Muscular middle layer of the heart.
- 7. Abnormal swishing sound caused by improper closure of the heart valves
- 11. Smallest type of blood vessel
- 12. Gas that enters the blood through the lungs and travels to the heart
- 13. Thin-walled vessel that carries blood from body tissues and lungs back to the heart