Blood is made up of four main parts:
red blood cells,
white blood cells,
platelets, and
plasma.
There are different types of blood because each red blood cell has special chemical markers called antigens. There are also antibodies (cells that fight particular groups of antigens) in the plasma of blood.
Group A blood has A antigens on its red cells, and anti-B antibodies are contained in the plasma.
Group B blood has B antigens on its red cells, and anti-A antibodies in the plasma.
Group O blood has no antigens at all, but it has both anti-A and anti-B antibodies.
Group AB blood has both A and B antigens, but no antibodies.
red blood cells,
white blood cells,
platelets, and
plasma.
There are different types of blood because each red blood cell has special chemical markers called antigens. There are also antibodies (cells that fight particular groups of antigens) in the plasma of blood.
Group A blood has A antigens on its red cells, and anti-B antibodies are contained in the plasma.
Group B blood has B antigens on its red cells, and anti-A antibodies in the plasma.
Group O blood has no antigens at all, but it has both anti-A and anti-B antibodies.
Group AB blood has both A and B antigens, but no antibodies.
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