The Transport System in Human

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Across
  1. 6. The two lower chambers of the heart
  2. 8. The heart is divided into a left and right side by this structure
  3. 9. Substances are transported in and out of this organism by diffusion
  4. 11. Large blood vessels with very thick walls
  5. 14. Blood that is rich in oxygen
  6. 15. The _________ system is responsible for transporting substances around the body
Down
  1. 1. Process by which particles spread from a region where there are many, to a region where there are few particles
  2. 2. Hole or passage way through which blood flows
  3. 3. Blood vessels that are only one-cell thick
  4. 4. Prevent the back flow of blood in the veins
  5. 5. One of the upper chambers of the heart is called the __________
  6. 7. Organ which pumps blood around the body
  7. 10. Carries blood back to the heart
  8. 11. Largest artery in the body
  9. 12. Blood that has given up its oxygen is said to be ________
  10. 13. One of the substances transported to the body cells