![]() ![]() Which type you are is important if you need a blood transfusion. So if you have type A blood, it's either A positive or A negative. Also, blood is either Rh-positive or Rh-negative. There are four blood types: A, B, AB, or O. Some white blood cells live less than a day, but others live much longer. Red blood cells live about 120 days, and platelets live about 6 days. Blood cells constantly die and your body makes new ones. ![]() Bone marrow, the spongy material inside your bones, makes new blood cells. Platelets help blood to clot when you have a cut or wound. White blood cells (WBC) fight infection and are part of your immune system. Red blood cells (RBC) deliver oxygen from your lungs to your tissues and organs. The solid part of your blood contains red blood cells, white blood cells, and platelets. ![]() The liquid part, called plasma, is made of water, salts, and protein. Your blood is made up of liquid and solids. ![]()
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