Look at blood smeared across a slide under a microscope, and you see a mystery revealed. The ruby-colored, vital, fluid of life we call blood is made of lots of stuff. There is the liquid plasma that ...

Add Yahoo as a preferred source to see more of our stories on Google. human red blood cells under microscope with two white blood cells A pregnant woman's blood sample taken in 1972 was mysteriously ...

BBC health correspondent James Gallagher gets his blood analysed to understand how air pollution is killing us.

Red blood cells carry oxygen from the lungs around the body. They then carry carbon dioxide from around the body back to the lungs. These cells are an important component of blood. However, a range of ...