circulatory system

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Across
  1. 4. blood cells are required for the clotting process.
  2. 7. blood vessel that carries blood back to the heart.
  3. 8. the circulatory system transport this, which helps regulate temperature.
  4. 9. what do B cells destroy?
  5. 12. where does the blood flow through?
  6. 13. valve between the right ventricle and ___ artery.
  7. 14. the heart____blood.
  8. 15. They are made when a large cell called a ____fractures into 2000-3000 pieces.
  9. 17. blood in arteris is bright red because it is ___.
  10. 20. liquid part of the blood.
  11. 21. muscular middle layer of the heart.
Down
  1. 1. The liquid in the circulatory system.
  2. 2. Prevent blood loss when injured by promoting____.
  3. 3. what another name for white blood cells?
  4. 5. waste gas that is transported in veins from the body to the lungs via the heart
  5. 6. a region of the body called the ____, between the lungs
  6. 10. The circulatory system __ nutrients, gases, liquids, and heat around the body.
  7. 11. A small vessel that connects veins and arteries.
  8. 16. another name for red blood cells.
  9. 18. complex protein on red blood cells.
  10. 19. what does RBCs do not have?