Across
- 4. the only white blood cells that contain histamine
- 6. the process that produces blood cells
- 9. the outermost protective layer of the heart
- 12. the organ where blood goes to be oxygenated
- 14. one of two upper chambers in the heart that receive blood from veins
- 16. a fibrous sac that encloses the heart and keeps it in a stable location
- 18. records the electrical signal from the heart
- 20. one of two lower chambers in the heart that forcefully pump blood out
- 21. a protein inside red blood cells that carries oxygen
Down
- 1. largest artery of the body
- 2. when the heart muscle contracts
- 3. when the heart muscle relaxes and the chambers fill with blood
- 5. largest vein of the body; divided into superior and inferior parts
- 7. the heart is located behind and slightly to the left of this bone
- 8. the location where stem cells are produced and give rise to different blood cells
- 10. the process by which a blood clot is formed
- 11. white blood cells that include B cells and T cells
- 13. clear liquid part of blood that remains after blood cells and clotting proteins have been removed
- 15. a protein involved in forming blood clots
- 17. a thin serous membrane lining the cavities of the heart
- 19. name of the student who created this puzzle