Cardiovascular System

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Across
  1. 1. the number of valves in the heart
  2. 4. the organ where blood picks up oxygen
  3. 8. the two top chambers of the heart
  4. 9. blood vessels that carry blood away from the heart
  5. 10. the type of blood with little oxygen in it
Down
  1. 2. the type of blood with a lot of oxygen in it
  2. 3. the two bottom chambers of the heart
  3. 5. blood is never this color
  4. 6. the structures that make sure blood flows in one direction
  5. 7. blood vessels that carry blood toward the heart
  6. 11. the largest artery