Circulatory System

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Across
  1. 1. Blood vessel that returns blood back to the heart
  2. 3. Vessels taking the blood to and from the body
  3. 7. Fluid portion of blood
  4. 10. Protein produced in the body in response to the presence of antigens or foreign bodies
  5. 11. Prevent backward flow of blood
  6. 12. White blood cell
  7. 13. Rhythmic expansion of artery as a result of heart contraction. Can be felt in arteries close to skin surface
  8. 14. Vessels taking blood to and from the body
  9. 16. System of vessels carrying lymph. Also involved in immunity
  10. 18. Tiny artery
Down
  1. 2. Red blood cell
  2. 4. High blood pressure
  3. 5. Component of blood responsible for clotting
  4. 6. Relaxing of smooth muscle in blood vessel. Result in vessel widening
  5. 8. Narrowing of blood vessel
  6. 9. Smallest blood vessel whose walls are only one cell thick
  7. 15. Tiny vein
  8. 17. Muscular blood vessel that carries blood away from the heart