Blood cell

A blood cell is any cell of any type normally found in blood. In mammals, these fall into three general categories:

Red blood cell, whose main purpose is the transport of oxygen;
White blood cell, which produces antibodies to fight infection;
Platelet, which is actually a fragment of the large bone marrow cells known as megakaryocytes and are important in blood clotting.

Together, these three kinds of blood cells sum up for a total 45% of blood tissue (55% is plasma).

External links

What is Blood? from the Genetic Science Learning Center at the University of Utah.
Cells of the blood

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