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The Life Cycle of an Erythrocyte Essay title: The Life Cycle of an Erythrocyte The diameter of a typical human erythrocyte is 6-8 µm. Adult humans have roughly 2-3 Ч 1013 red blood cells at any given time (women have about 4-5 million erythrocytes per cubic millimeter of blood and men about 5-6 million). Red.