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BLOOD TYPES
U3:L2
11 BIOLOGY
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BLOOD TRANSFUSIONS
About 5 million Americans need blood
transfusions every year, for all sorts of reasons. Sometimes, a transfusion is an
emergency (like losing blood after an accident). Sometimes it's expected (as
with treatment for cancer).
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antigens
All blood contains the same basic components (red cells, white cells, platelets, and plasma), but not everyone has
the same types of markers on the surface of their red blood cells.
These markers (also called antigens) are proteins and
sugars that our bodies use to identify the blood cells as belonging in our own system.
Blood cell markers are microscopic. But they can make the difference between blood being accepted or rejected after a transfusion. So medical experts group blood into
types based on the different markers.
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antibodies
• Blood markers are also in
plasma.
• These plasma blood
markers are called
antibodies. • They are the body’s
response to antigens.
• Antibodies are proteins
made by the immune
system.
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Rh FACTOR
Some people have an additional marker, called Rh factor, in their blood.
Rh is a protein on the red blood cell.
Because each of the four main blood groups (A, B, AB, and O) may or may not have Rh factor, scientists further classify
blood as either "positive" (meaning it has Rh factor) or "negative" (without Rh factor).
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BLOOD TESTING
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What information can
blood tests give you?
• Whole blood to count blood cells
• Separate blood cells from the fluid that contains them
(plasma)
• Plasma is used to measure substances in the blood
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HEMATOCRIT
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