The Circulatory System

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Across
  1. 2. part of the immune system
  2. 5. small chamber in the heart
  3. 7. without oxygen
  4. 8. the largest artery
  5. 9. the circuit that takes blood to/from the lungs
  6. 10. Organ that pumps blood
  7. 11. part of the blood involved in clotting
  8. 15. vessels that carry blood to the heart
  9. 16. large chamber in the heart
  10. 18. the circuit that takes blood to/from the body
  11. 20. Organ where oxygen enters the body
Down
  1. 1. percentage of red blood cells in the body
  2. 3. the "water" of the blood
  3. 4. the heart, blood, and vessels
  4. 6. a waste gas that is expelled through the lungs
  5. 10. protein that carries oxygen
  6. 12. vessels that carry blood from the heart
  7. 13. molecule that cells need to get energy
  8. 14. flaps that stop blood from going backwards
  9. 17. contained oxygen
  10. 19. tiny vessels where oxygen is dropped off