Heart structure and blood flow

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Across
  1. 2. The organs where blood collects oxygen
  2. 7. The lower chamber of the heart that pumps blood out
  3. 8. A gas carried by blood that cells need for energy
  4. 9. A space inside the heart where blood flows
  5. 11. The upper chamber of the heart that receives blood
  6. 12. The muscular organ that pumps blood around the body
  7. 13. A blood vessel that carries blood toward the heart
Down
  1. 1. The movement of blood around the body
  2. 3. The artery that carries blood from the heart to the lungs
  3. 4. The liquid that carries oxygen nutrients and waste
  4. 5. A blood vessel that carries blood away from the heart
  5. 6. The large vein that returns blood from the body to the heart
  6. 7. A structure in veins that stops blood flowing backwards
  7. 10. The largest artery that carries blood from the heart to the body