Question

Brife note on blood group.

Answer 1

A blood type (also called a blood group) is a classification of blood based on the presence and absence of antibodies and also based on the presence or absence of inherited antigenic substances on the surface of red blood cells (RBCs). here are four main blood groups (types of blood): A, B, AB and O. Your blood groupis determined by the genes you inherit from your parents. Each group can be either RhD positive or RhD negative.

Answer 2

The ABO blood group system is the most important blood type system in human blood transfusion.

they are Found on platelets, epithelium, and cells other than erythrocytes, AB antigens  can also cause an adverse immune response to organ transplantation.

the fluid that is pumped through the body by the heart and contains plasma, 
blood cells, and platelets; "blood carries oxygen and nutrients to the tissues 
and carries away waste products".