Across
- 6. circulation that moves blood between the heart and lungs
- 7. circulation that supplies blood to the body tissues
- 8. network of fibers that spread electrical impulses through the ventricles
- 10. high blood pressure
- 12. valve between the right atrium and ventricle
- 13. wall separating heart chambers
- 14. valve between right ventricle and pulmonary artery
- 16. the largest artery in the body
- 19. lower chamber of the heart
- 20. the outer layer of the heart wall
Down
- 1. blood vessel that carries blood away from the heart
- 2. low blood pressure
- 3. the inner lining of the heart wall
- 4. heart relaxation phase
- 5. heart's natural pacemaker
- 9. the thick, muscular layer of the heart responsible for contractions
- 11. contraction phase of the heart
- 15. valve between left atrium and ventricle
- 17. upper chamber of the heart
- 18. blood vessel that carries blood to the heart