Across
- 3. Two largest veins in the body(two words)
- 5. Muscular middle layer of the heart
- 8. Weighs less than a pound
- 10. Double layer membrane that surrounds the heart
- 12. Contraction of the heartbeat
- 13. Beat of the heart you feel through the walls of the arteries
- 14. Records electrical activity of the heart
Down
- 1. One of two upper chambers of the heart
- 2. Smallest type of blood vessel
- 3. One of two lower chambers of the heart
- 4. The inner lining of the heart
- 6. Relaxation of the heartbeat
- 7. Specialized nervous tissue in the right atrium that begins the heartbeat
- 9. Small vein
- 11. Abnormal swishing sound