The red blood cells of the body are better known as hemoglobin. There may be different things that you will find in the red blood cells such as oxygen but what of the things that you will find is iron. Iron is known to be one of the elements that will be needed in the production of blood.
In order to make sure that the body will be able to function normally, it would need the right supply of blood spread throughout the various organs of the body. Hemoglobin is needed by the body because this is responsible for making sure that the transfer of oxygen in the blood going to the lungs and the various parts of the body will always be possible.