Across
- 2. One of two lower chambers of the heart
- 4. Relaxation phase of the heart
- 6. Smallest blood vessel
- 10. One of two upper chambers of the heart.
- 11. Valve between the left atrium and the left ventricle
- 12. Largest artery in the body
Down
- 1. Contraction phase of the heart beat
- 3. Innermost lining of blood vessel
- 5. valve located between the right atrium and the right ventricle
- 7. Largest type of blood vessel
- 8. Inner lining of the heart
- 9. Abnormal heart sound caused by improper closure of the heart valves