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