THE HEART

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