There are 500 red corpuscles to every one white corpuscle in the blood.
Red corpuscles carry oxygen through the blood. They are very small discs and there may be several million of them in a single drop of blood. They wear out quite quickly, with in a few weeks, and are remade in the bone marrow. White corpuscles are much larger and rather shapeless. Their function is to fight disease in the body by crowding round bacteria and digesting them. The body makes more white corpuscles when necessary to deal with attacks by germs The plasma itself, in which the corpuscles float, carries food and chemicals throughout the body and brings back carbon dioxide to be passed out through the lungs. If the bone marrow becomes disordered, leukemia, a disease of the white corpuscles, can result. which is usually fatal.