The Circulatory System

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Across
  1. 2. the vena cava carrying deoxygenated blood from the lower and middle part of the body
  2. 5. pumps blood through your body using the circulatory system
  3. 7. the heart has 4 of these
  4. 11. the upper chambers of the heart
  5. 12. blood enters the heart through it
Down
  1. 1. the lower chambers of the heart
  2. 3. blood returns from the lungs to the heart through these
  3. 4. carries blood from the body into the lungs
  4. 6. the heart is not technically an organ, it is a
  5. 8. blood leaves the heart through it
  6. 9. the vena cava carrying deoxygenated blood from the upper part of the body
  7. 10. little "doors" that allow blood to flow throughout the heart