Circulatory System Blood Vessels

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Across
  1. 3. blood moves forward through the veins by pressure brought about by the contraction of their ___ walls
  2. 4. blood flows through the heart in just ___ direction
  3. 7. valve between the right atrium and the right ventricle
  4. 8. the ___ walls of arteries allow them to withstand the increased pressure of blood from the heart
  5. 11. blood vessels that carry blood from the different body parts back to the heart
  6. 12. valve between the left ventricle and the aorta
  7. 13. smallest arteries in the body that branches out from large arteries
  8. 14. valve between the left atrium and the left ventricle
Down
  1. 1. the largest artery in the system
  2. 2. valve between the right ventricle and pulmonary artery
  3. 5. very fine blood vessels joined by the arterioles that form a network in organs and tissue
  4. 6. thick-walled and elastic blood vessel that carries blood away from the heart
  5. 9. blood ___ form a network through which blood reaches all the body parts
  6. 10. the largest veins in the system