Cardiovascular system

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Across
  1. 5. the lower chambers of the heart
  2. 7. smallest blood vessels where oxygen and nutrients are exchanged
  3. 11. natural pacemaker of the heart
  4. 12. largest artery in the body that carries oxygenated blood from the heart
  5. 13. blood vessels that carry blood back to the heart
Down
  1. 1. blood cells that help in clotting
  2. 2. protein in red blood cells that carries oxygen
  3. 3. blood vessels that carry blood away from the heart
  4. 4. valve between the left atrium and the left ventricle
  5. 6. blood cells that carry oxygen
  6. 7. the process of blood clotting
  7. 8. sound your heart makes when the valves close
  8. 9. upper chambers of the heart
  9. 10. blood cells that fight infection
  10. 11. muscular wall that separates the left and right sides of the heart ,