Learn about blood typing and the rarest and most common types of blood and how they can impact your blood donation.. The blood that runs through the veins, arteries, and capillaries is known as whole blood—a mixture of about 55%.
A blood type (also known as a blood group) is a classification of blood based on the presence and absence of antibodies and inherited antigenic substances on the surface of red blood cells (rbcs).. Blood is a fluid that transports oxygen and nutrients to cells and carries away carbon dioxide and other waste products.