The Biology crossword puzzle

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Across
  1. 2. made up of fat, cholesterol, blood cells and other substance
  2. 4. Routes that blood travels
  3. 7. Carries important "stuff" through body
  4. 8. Deficiency in the number or quality of red blood cells
  5. 9. can be found whenever and artery passe over a bone
  6. 11. Happens if the blood supply to your brain is blocked.
  7. 13. Shape provide large surface area to take in oxygen
Down
  1. 1. the smallest and most numerous of the blood vessels
  2. 3. Which give the blood red
  3. 5. wind pipe
  4. 6. pumps or pushes blood through body
  5. 10. blood drifts back to the heart through wide veins, under very low pressure, veins keep it flowing in the right direction and prevents backflow
  6. 12. Protect your lungs