four types: A, B, AB, and O. The letters A and B refer to a kind of antigen, or protein, on the surface of red blood cells. The surface of red blood cells in Type A blood has antigens known as A-antigens; the surface of red blood cells in Type B blood has antigens known as B-antigens; Type AB blood has both A-antigens and B-antigens, and Type O blood has neither A-antigens nor B-antigens. Each blood type is also
Human blood is grouped into four types: A, B, AB, and O. The letters A and B refer to a kind of antigen, or protein, on the surface of red blood cells. The surface of red blood cells in Type A blood has antigens known as A-antigens; the surface of red blood cells in Type B blood has antigens known as B-antigens; Type AB blood has both A-antigens and B-antigens, and Type O blood has neither A-antigens nor B-antigens. Each blood type is also grouped by its Rh factor. Rh refers to another type of antigen which we will refer to as the Rh antigen. All blood is either Rh positive (Rh+) or Rh negative (Rh−). Rh+ blood has the Rh antigen and Rh− blood does not have the Rh antigen.
For example, if you have Type A blood and your Rh factor is Rh−, then your blood type is said to be "A negative" (A−). People with A− blood have A-antigens, but have neither B-antigens nor Rh antigens. Using this system there are eight different classifications. Each person will have one of the following blood types: A+, A−, B+, B−, AB+, AB−, O+, and O−.
Sketch a Venn diagram showing the three types of antigens, A, B, and Rh, and label each of the eight regions with the correct blood type.
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