The Heart

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Across
  1. 8. Valve between the atrium and ventricle
  2. 10. Top two chambers of the heart
  3. 11. Blood vessel away from the heart
  4. 12. Flows to the heart
  5. 13. Prevent the back flow of blood
Down
  1. 1. Bottom two chambers of the heart
  2. 2. Blood vessel from the lungs to the heart
  3. 3. Artery supplying the heart muscle with blood
  4. 4. Flows away from the heart
  5. 5. Relaxation of the heart
  6. 6. The pace maker
  7. 7. Blood vessel from the heart to the lungs
  8. 9. Blood vessel to the heart