Across
- 4. blood vessels that carry blood away from the heart
- 7. flaps of tissue that open and close to allow the flow of blood in one direction only
- 8. a widening of a blood vessel
- 10. provides blood to body and head
- 13. carries blood to the heart
- 14. narrowing of the blood vessels
- 15. exchanges take place between the blood and cells out of the body
Down
- 1. the two lower chambers of the heart
- 2. the two upper chambers of the heart
- 3. liquid part of the blood
- 5. a protein found within red blood cells
- 6. found within the lymph nodes
- 9. the ability of an organism to resit infection
- 11. divides the right and left chambers of the heart
- 12. specialized proteins that help in destroying infectious agents