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