Circulatory system

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Across
  1. 2. breathes in oxygen and pumps out carbon dioxide
  2. 5. muscular middle part of the heart
  3. 7. upper chamber of the heart
  4. 10. pumps blood throughout the body
  5. 11. pumps blood back to the heart
  6. 12. between left ventricle and aorta
  7. 13. blood is pumped to wherever it has to go
Down
  1. 1. lower chamber of the heart
  2. 3. muscular wall that separates the heart
  3. 4. smaller veins
  4. 6. defends the circulatory system from unwanted substances
  5. 8. brief period of rest in the heart
  6. 9. carries blood wherever
  7. 11. blood travel throughout it