"Blood donation" means donating excess blood that is not needed by the body to patients, which is not harmful to blood donors, because everyone's body has about 17-18 cups of blood, and the body only uses 15-16 cups of water, and the rest can be donated to others, and blood can be donated once every three months. When donating blood, bone marrow is an important part of replacing the formation of blood cells, so that the number of blood cells in the body remains unchanged. If you don't donate blood, your body will drive blood cells that are decomposed due to expiration. This process takes about 20 minutes from the beginning of registration to the completion of blood donation.
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