| __ | 11. | Artery | | A. | Protein in red blood cells that helps to transport oxygen |
| __ | 12. | Capillary | | B. | Structure in heart and veins to prevent back flow |
| __ | 13. | Capillary Bed | | C. | Shorter circ. route where blood is pumped to the lungs |
| __ | 14. | Hemoglobin | | D. | Muscular blood vessel, carries blood from heart to body |
| __ | 15. | Pulmonary circulation | | E. | Thinner-walled blood vessel bringing blood back to heart |
| __ | 16. | Rich in CO2 | | F. | Smallest blood vessel for exchanges between blood and organs |
| __ | 17. | Rich in oxygen | | G. | Left side of circulatory system |
| __ | 18. | Systemic circulation | | H. | Right side of circulatory system |
| __ | 19. | Valve | | I. | Longer circ. route where blood is pumped to the whole body |
| __ | 20. | Vein | | J. | Group of capillaries on organs, to transfer nutrients, O2.. |