Blood and Blood Groups

Some more notes for OCR 21st century biology B7 on Blood and Blood groups 

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  • Created on: 14-06-11 09:34
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Blood
1) Red Blood Cells ­
These transport oxygen around the body.
They contain a protein called haemoglobin which binds
oxygen as it passes through the lungs. The oxygen is
released from the haemoglobin as blood circulates through
the body.
They are flexible which allows them to swiftly moves through capillaries.
2) White Blood Cells
They protect the body from infection by producing antibodies which
engulf and digest Micro organisms.
3) Platelets
They are small fragments of cells which help the blood to clot at the site of
a wound and stops too much blood being lost.
4) Plasma ­
It is the liquid that carries the blood around.
Plasma is mainly water which carries a range of dissolved materials.
When Blood Transfusions take place, Doctor's must ensure that the patient is getting
the right Blood Group otherwise it could cause unnecessary blood clotting,
endangering the patient.
There are 3 blood Groups.
Group A ­ made up of A antigens on the surface of the cell. Also contains Anti ­
B Antibodies in the plasma
Group B ­ made up of B antigens on the surface of the cell. Also contains Anti ­
A antibodies in the plasma
Group O ­ contains no antigens on the surface of the cell. ­ Contains both Anti
A and Anti B antibodies in the plasma
Group AB ­ made up of A and B antigens on the surface and contain no
antibodies in the plasma.

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Group AB is known as the universal recipient as they can receive blood from
anyone.
Group O is known as the universal donor as it can be given to any blood type as
they contain no antigens.
Blood Type Antigens Antibodies Can give Can receive
blood to... blood from...…read more

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