Across
- 4. prevent the backflow of the blood
- 6. valve between left ventricle and aorta
- 8. atrium receives deoxygenated blood from the body
- 10. are chemical substances that act like messenger in the body
- 11. upper chambers of the heart
- 12. size of the heart
- 13. lower chamber of the heart
- 14. valve divides left atrium and left ventricle
- 15. sound of the heartbeat
Down
- 1. valve divides the right ventricle from the pulmonary artery
- 2. ventricle pumps blood to the rest of the body
- 3. valve divides between right atrium and right ventricle
- 5. blood from the lungs back to the heart
- 7. oxygen -poor blood
- 9. pumps blood