Across
- 3. condition of a fast heartbeat
- 6. also known as an ECG or EKG
- 9. carries blood away from the heart to all parts of the body
- 12. begins the heartbeat in the right atrium
- 13. when the heart contracts
- 14. when the heart relaxes
- 15. wall that divides the atrium and ventricle
Down
- 1. membrane that surrounds the heart
- 2. condition of a slow heartbeat
- 4. smallest type of blood vessel
- 5. is caused by improper closure of the heart valves
- 7. muscular middle layer of the heart
- 8. lower tip of the heart
- 10. small artery
- 11. gas released by body through exhalation