Blood Vessels and Blood Composition

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Across
  1. 3. blood vessels with the thickest walls
  2. 6. high blood pressure
  3. 8. red blood cell
  4. 9. the smallest blood vessels
  5. 12. thrombin converts fibrinogen into ______
  6. 13. swelling due to blocked lymph vessels
Down
  1. 1. blood vessels that contain valves
  2. 2. muscle only arteries and veins have this
  3. 3. hardening of arteries
  4. 4. as the area of a vessel increases, blood velocity will ______
  5. 5. a single layer of epithelial cells lining blood vessels
  6. 7. blood liquid matrix
  7. 10. cell that plays big part of immune response
  8. 11. as the area of vessel decreases, blood velocity will _____