Blood cell

Overview
A blood cell (also called blood corpuscle) is any cell of any type normally found in blood. In mammals, these fall into three general categories:


 * Red blood cells
 * White blood cells
 * Platelets

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

Disorders
A decrease in number of blood cells is called cytopenia. An increase, on the other hand, is called polycythemia.