Medically reviewed by Soma Mandal, MD Petechiae are tiny red, purple, or brown spots on your skin, inside of your mouth, or ...

Narrator: Blood gets around our bodies through a system of blood vessels. To picture the ... has different cells with different jobs. Some cells do repairs if you get a cut. Red blood cells ...

The Defense Advanced Research Project Agency, the Pentagon's top research arm, wants to find out if red blood cells could be modified in novel ways to protect troops and help them manage extreme ...