Biology

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Across
  1. 1. doctors use an artificial ______ to help the heart
  2. 4. the heart has ______ chambers
  3. 7. red cells have this pigment
  4. 9. it carries blood around the ______
  5. 10. node the heart’s natural pacemaker
  6. 11. blood cell the cell that fights germs
  7. 12. carries blood away from the heart
  8. 14. the cell part that helps stop bleeding
  9. 15. it is in the right ______
  10. 18. the bottom chambers are called ______
  11. 19. carries blood to the heart
Down
  1. 2. system it includes the heart and blood vessels
  2. 3. the valve between left atrium and ventricle is ______ valve
  3. 5. it brings ______ and nutrients
  4. 6. blood cell the cell that carries oxygen
  5. 8. the smallest blood vessel
  6. 9. it controls the heart ______
  7. 13. the top chambers are called ______
  8. 16. arteries have ______ walls
  9. 17. blood goes back to the heart through ______