Circulatory system

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Across
  1. 4. a system that sends blood to the heart to then be sent to the lungs
  2. 5. blood goes through here
  3. 8. CO2
  4. 10. gives oxygen to blood cells
Down
  1. 1. arteries/veins
  2. 2. irregular beating of the heart
  3. 3. carries blood towards heart
  4. 6. carries oxygen to organs/muscles
  5. 7. carries blood away from the heart
  6. 9. opens/closes allowing blood to pass