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Blood Clotting and
Transfusions…read more

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Blood Clotting
· When you get injured, your blood clots to prevent
too much bleeding
· A clot is a mesh of protein fibres, called fibrin
fibres, that `plugs' the damaged area
· Clots are formed by a series of chemical reactions
that take place when platelets in the blood are
exposed to damaged blood vessels…read more

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When blood doesn't
clot properly
· Too little clotting could mean that a person could bleed to death
· Too much clotting can cause strokes and deep vein thrombosis
(DVT)
· People who are at risk of a stroke or DVT can take drugs to
reduce this risk. Examples are:
· Warfarin
· Heparin
· Aspirin
· Haemophilia is a genetic condition where the blood doesn't clot
easily
· This is because a clotting factor can't be made in the body
· This missing clotting factor can be injected…read more

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Blood type
· If a person is in an accident or hiving surgery, lots of
blood can be lost
· This needs to be replaced by a blood transfusion
· People have different blood types. The 4 different
types are
· A
· B
· AB
· O
· These letters refer to the type of antigens on the
surface of a person's red blood cells…read more

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Antigens and antibodies in
the blood
· Red blood cells can have A, B, A and B or no
antigens on their surface
· Blood plasma can contain anti-A, anti-B, both or
no antibodies
· If, for example, an anti-A antibody meets an A
antigen, the blood clumps together
· This is known as agglutination
· The same thing happens if an ant-B antibody
meets a B antigen…read more

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