Across
- 4. pigment containing iron and a protein
- 7. white blood cells
- 8. the outermost layer of the heart
- 9. innermost layer of the heart
- 13. bridge between the external & internal environments
- 14. passage of blood cells through capillary walls into the tissues
- 18. the study of veins
- 19. clear straw colored liquid
- 21. the study of blood
- 22. does not have granules in the cell
- 23. a process the heart goes through to pump blood
- 24. the smallest blood vessels
Down
- 1. green pigment
- 2. platelets
- 3. movement of oxygen and carbon dioxide by red blood cells
- 5. contains small granules within a cell
- 6. smallest blood cells
- 10. provides the blood supply to the head and neck
- 11. carries blood towards the heart
- 12. middle layer of the heart
- 15. serves to drain face and brain
- 16. study of the circulatory system
- 17. the dilation of the cardiac cycle
- 20. reddish-brown pigment
- 22. carries blood away from the heart