Circulatory System

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Across
  1. 5. Arteries deal with ______.
  2. 6. Arteries do not have ______.
  3. 8. The ______ sends out an electrical impulse to start the contracting of the heart muscle.
  4. 9. Fibers that deliver electrical impulses, causing depolarization.
  5. 11. Key organ in circulatory system.
  6. 12. Separates the RA from the RV.
  7. 14. Carry blood away from the heart.
  8. 15. Valve that has 2 flaps.
  9. 16. Thick, inner "flesh"
  10. 19. How many layers do the aterial walls have?
Down
  1. 1. Main functions of the heart are to transport nutrients and _____.
  2. 2. One of the two heart chambers.
  3. 3. Microscopic blood vessels.
  4. 4. Smaller arteries.
  5. 7. The largest part of your heart is on the _____.
  6. 8. Wall that divides heart into left and right.
  7. 9. Comes in contact with outside organs.
  8. 10. Shut during cardiac diastole.
  9. 13. Carry blood back to heart.
  10. 17. Capillaries are only _____ layer(s) thick.
  11. 18. Largest artery.