The Heart

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Across
  1. 3. The lower chambers of the heart
  2. 4. The vessel that carries blood to the heart
  3. 5. The vein that returns blood to the heart from the body
  4. 6. The largest blood vessel
  5. 8. The valve between the left atrium and ventricle
  6. 9. The vessel that carries blood through tissues
  7. 11. The phase of the cardiac cycle when heart muscles relax
  8. 12. The process by which gases are exchanged
  9. 14. The vessel that carries blood away from the heart
  10. 15. Humans are said to have a _________ circulatory system
Down
  1. 1. The only artery that carries deoxygenated blood
  2. 2. The upper chambers of the heart
  3. 7. The valve between the Right atrium and ventricle
  4. 10. The only vein that carries oxygenated blood
  5. 13. The phase of the cardiac cycle where the atria and ventricles contract