Objective21: Explain ABO Blood Types and Their Importance in Blood Transfusions

This site is where I learned about ABO blood types and why they are important to blood transfusions. I learned of the four principle blood types(A,B,AB,and O). It also became clear that there are basically 2 antigens and 2 antibodies.

ABO Blood Type
		Antigen A	Antigen B		Antibody anti-A	Antibody Anti-B
A		yes	no		no	yes
B		no	yes		yes	no
O		no	no		yes	yes
AB		yes	yes		no	no