White Blood Cells, Red Blood Cells, Platelets and Plasma

Once there was a boy who was looking at a book about the things in your blood. He found out that the things in your blood are red blood cells, white blood cells, platelets and plasma. He was so exited he kept on reading the book. He found out that red blood cells are like trucks that carry oxygen to every cell in your body and that there are so many red blood cells your blood becomes red. He found out that white blood cells are like solders of your body and they kill germs so you do not get sick. He read that white blood cells flow through your blood as well as red blood cells. Then he found out about platelets. He now knew that platelets come rushing to the place you are bleeding and they make a thing that makes you stop bleeding. Their job is only a few seconds long. Finally he read about plasma. Plasma is a liquid that red blood cells, white blood cells and platelets travel through. He found out about a lot of things in the book and he couldn't wait to tell his friends about red blood cells, white blood cells, platelets and plasma.