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Across 4. blood from the upper body returns to the heart via the ____________ vena cava 5. vessels that carry blood away from the heart 6. term for stoppage of bleeding 10. main function of the Cardiovascular system 13. one of the places hematopoiesis occurs as a fetus 15. Cell responsible for blood clotting 16. __________ make up 45% of blood 17. Biconcave shaped cells 22. Blood enters the __________ atrium first when returning from the heart 23. _______________________ makes up 55% of blood 27. Cell that helps fight infection 28. Pulse taken at the neck

Down 1. When capillaries come together and become bigger 2. Blood enters the __________ atrium first when returning from the body 3. Pulse taken on the arm 5. when arteries branch off and become smaller 7. blood from the lower body returns to the heart via the ___________ vena cava 8. first step of hemostasis 9. Blood is a type of ________________ tissue 11. vessels that carry blood back to the heart 12. circuit of blood flow that goes from the heart to the lungs and back 14. makes up hemoglobin 18. smallest vessels found in the body where most diffusion of nutrients occur 19. third step of hemostasis 20. The pressure in the arteries when the atrium contract 21. portion of erythrocyte that carries oxygen molecules 24. circuit of blood flow that goes from the heart to the body and back 25. The pressure in arteries when the ventricles contract 26. Pulse taken by the wrist