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Across 2. deoxygenated blood 5. the most commonly used veins for venipuncture 7. is the fluid that is transported throughout the body 10. smaller branch of an artery; a miniature artery 13. lungs 15. agent that prevents blood from clotting 18. cessation of bleeding; clot formation 19. the largest artery 22. having more oxygen than carbon dioxide 25. oxygentated blood 26. are the smallest blood vessel 29. having a higher concentration of carbon dioxide than oxygen 30. occurs when blood collects under the skin, forming a black and blue mass 31. substance containing old leukocytes, pathogens, and other debris; created at the site of infection once the white blood cells undergo phagocytosis 32. body

Down 1. are blood vessels that carry deoxygenated blood toward the heart 3. are openings and only opens in one direction 4. body system of organs that work to circulate blood throughout the body 6. is the outermost layer ofthe hearts muscle 8. protects against infections 9. largest vein in the body 11. aid in blood clotting 12. iron-rich protein molecules found in red blood cells; transports oxygen and carbon dioxide 14. contain hemoglobin; transports oxygen and carbon dioxide 16. heart 17. formed elements 20. originates from stem cells 21. is the muscular middle layer 23. the inside layer of the heart muscle 24. liquid 27. is developed from th lymphatic system 28. is a wall of muscle which divides it down the middle into the left and right sides