Blood vessels/circulatory system

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Across
  1. 1. The smallest veins
  2. 4. Gas we need to live
  3. 6. Vessels bring blood back to the heart
  4. 9. Body system bringing oxygen into our bodies
  5. 10. number of layers in an artery
  6. 11. Vessels that take blood away from the heart
  7. 12. Blood in the arteries is under ___________ pressure
  8. 13. Gas we exhale
  9. 15. The number of Red Blood Cells
  10. 17. Blood Vessels where the exchange of gases and nutrients happens
  11. 20. Body system breaking down food into nutrients
Down
  1. 2. Stuff carried by the blood as the result of food you eat
  2. 3. Body system that releases hormones
  3. 5. Inside layer of cells in arteries
  4. 7. When valves don't work, blood pools and causes ___________ veins
  5. 8. Leftovers from our cells using food
  6. 14. Fluid that is pumped through the body by the circulatory system
  7. 16. A flap of tissue in the vein preventing blood from going backward
  8. 18. The smallest arteries
  9. 19. Type of muscles that are in blood vessels