Question

Refer Internet to collect information
on kinds of blood group. Write an assignment on it.

Answer 1

There are 4 main blood groups (types of blood) – A, B, AB and O. Your blood group is determined by the genes you inherit from your parents.

Each group can be either RhD positive or RhD negative, which means in total there are 8 blood groups.

Antibodies and antigens

Blood is made up of red blood cells, white blood cells and platelets in a liquid called plasma. Your blood group is identified by antibodies and antigens in the blood.

Antibodies are proteins found in plasma. They're part of your body's natural defences. They recognise foreign substances, such as germs, and alert your immune system, which destroys them.

Antigens are protein molecules found on the surface of red blood cells.

The ABO system

There are 4 main blood groups defined by the ABO system:

blood group A – has A antigens on the red blood cells with anti-B antibodies in the plasma

blood group B – has B antigens with anti-A antibodies in the plasma

blood group O – has no antigens, but both anti-A and anti-B antibodies in the plasma

blood group AB – has both A and B antigens, but no antibodies

Blood group O is the most common blood group. Almost half of the UK population (48%) has blood group.

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