But that's not all components of the blood. Each drop of blood contains red blood cells, which carry oxygen throughout your body In addition, blood also contains white blood cells that help the body fight infections and platelets that play an important role in blood clotting. Knowing blood type information is very important in emergency work for patients, especially those with rare blood types. If a person receives blood that contains antigens that do not match the blood type of the donor, the recipient's immune system will try to attack the foreign blood cells, which can lead to death. Our blood contains antigens that cover the surface of red blood cells and these antigens are important for determining blood type for the purpose of donating or receiving blood.
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