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Correction for the length of a Red Blood Cell

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How long is 0.000405 milimeters?
It's about one-twentieth as long as a Red Blood Cell
The length of a Red Blood Cell is about 0.0075 milimeters.
(a.k.a. RBCs, a.k.a. haematids, a.k.a. erythrocyte, a.k.a. erythroid cells, a.k.a. red blood corpuscles)
An average Red Blood Cell measures 7.5 ┬Ám (micrometers) in diameter. An average human has 20 - 30 trillion red blood cells in their body and each cell completes a circulatory lap in about 20 seconds.
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