Red blood is the exception, not the rule. Evolution has painted it green, purple and white in animals that push physiology ...

We all know blood is red. But not all red blood is created equal. The exact shade of your blood can actually tell you a lot about what’s happening inside your body. And while you might not spend much ...

Red blood cells transport oxygen throughout your body, including to vital organs and tissues. They also help your body get rid of carbon dioxide. Too little or too many red blood cells may be ...