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The three major types of cells in the blood are red blood cells, white blood cells, and platelets. Red blood cells determine blood type and are also responsible for transporting oxygen to cells. White blood cells are immune system cells that destroy pathogens and provide immunity.
Blood type is categorized based on which antigens are on the red blood cells. There are four antigens, or antigen groups: A, B, AB and O. Each of these can further be divided into positive and negative. For example, a person can have either A- blood or A+ blood.