heart

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Across
  1. 2. in blood but looks like water
  2. 4. part of blood that has the most nutrients
  3. 8. is the most muscular part of the heart
  4. 9. fill up the heart
  5. 10. the security guards of blood
  6. 11. the only gas in blood cells
Down
  1. 1. tinniest blood vessels ever
  2. 3. without this organ lower body parts wouldn't get blood
  3. 5. the one way tap found in veins
  4. 6. where blood reaches first in the heart
  5. 7. the only cells with oxygen
  6. 9. they empty the heart