"An individual blood cell takes about 60 seconds to make a complete circuit of the body."
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 — Erythrocytes
white blood cells — Leukocytes
platelets — Thrombocytes
Together, these three kinds of blood cells sum up for a total 45% of blood tissue by volume (55% is plasma). This is called the hematocrit and can be determined by centrifuge or flow cytometry.
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