We are studying the cardiovascular system in HS 20, and last class, we learnt that blood can be one of 4 main kinds: Type A, Type B, Type AB, or Type O. One's blood type is determined based on the presence or absence of antigen markers on the surface of their red blood cells. A simple test can be used to determine an unknown blood type. This is what we were doing in our lab activity today. :)
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