Recently asked questions about blood.
2009-07-29 22:06:43
A: Hemoglobin accounts for most of red blood cells, and hemoglobin’s light absorption changes when it is oxygenated. So it can appear almost blue when lacking oxygen and more red when rich in oxygen. That is why blood can sometimes appear brighter red outside the body, when it is more oxygenated.
2009-08-04 22:10:19