Blood is pretty complex. It's mostly a clear, pale yellow liquid called plasma. Click the beaker to see the blood cells. The red cells carry oxygen to our cells and carry waste carbon dioxide away. The little bits floating with them are platelets.
Platelets are like little corks.
They rush to a leak in the vein or capillary to plug it up. They start the process of healing. The larger white cells are like our guards against disease, white blood cells. They wrap themselves around invading germs and digest them. After you get tired of watching the cells flow, click the SO WHAT button below.