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> Blood cell
A
blood cell
is any cell of any type normally found in
blood
. In
mammal
s, these fall into three general categories:
red blood cells
, whose main purpose is the transport of
oxygen
white blood cells
, which act as immune cells and fight infection
Platelets
, which are actually fragments of the large bone marrow cells known as
megakaryocyte
s and are important in blood clotting
Blood and immune system cells
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