Blood and Blood Vessels: The Rivers Inside You

Let's talk about blood! Blood is more than the red stuff that comes out when you cut yourself. It is what carries nutrients and other things through your body. Without blood you would shrivel up and die! So let's find out more about this stuff.
In a grown man or woman there are about five or six quarts (litres) of blood. That's a lot. But what is blood?
Blood is really made up of lots of different things. There is plasma, red blood cells, white blood cells, and lots of other stuff.
Let's look ...