Circulatory System

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