The volume of blood in our bodies depends on a person’s body weight ... function of blood cells. Most begin in the blood cell factory, the bone marrow. The three main types are leukaemia ...

The four major blood groups are categorized based on two antigens, A and B, either being present or absent on the surface of your red blood cells ... blood type evolved may help your body ...

And your white blood cells are like police looking for germs. There's a lot going on inside you! Blood transports materials around the body and protects against disease. It contains: ...

We're all very complex organisms, made up of lots of different types of cells carrying out different jobs in our bodies; such as nerve cells, blood cells, fat cells and muscle cells. So ...