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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).

Contents

External links

External links

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

★ Cells of the blood