Blood is blood sacrifice part of your body is not required to provide to patients, which do not harm the donor, because each body will be 17-18 glass. The body uses just 15-16 glass only.
To donate blood, blood sacrifice of the body is not required. To the patient Which does not harm the donor. Because each body has a volume of 17-18 glasses of water bodies using only 15-16 glass.
Blood donation is to sacrifice the blood the body still have no use for patients, which is not harmful to the donor. Because each body of 17-18 glass body using only 15-16 glass only .