Across
- 2. contraction of the heart
- 5. upper two chambers of the heart
- 6. relaxation of the heart
- 7. microscopic exchange vessels
- 9. recording of the hearts electricity
- 11. cycle complete heart cycle
- 12. valves located between each ventricle and its large artery
Down
- 1. lower two chambers of the heart
- 3. cardiac muscle
- 4. two valves that separate atrial chamber from ventricles
- 8. layer of smooth muscle that lines the chambers of the heart
- 10. largest artery in the body