Heart

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Across
  1. 2. Collects deoxygenated blood and pumps it to the right ventricle
  2. 4. Prevents back flow of blood into the right atrium
  3. 6. Carry deoxigenated from the right ventricle to the lungs
  4. 10. Opens to allow blood to leave the heart
Down
  1. 1. Upper vein that returns blood to the heart
  2. 3. The lower right chamber of the heart
  3. 5. Carries oxygenated blood from the lungs back to the left atrium
  4. 7. Main artery of the human body
  5. 8. Receives oxygenated blood from the four pulmonary veins
  6. 9. Connects the left atrium and the left ventricle