Correction for the length of a Red Blood Cell
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How long is 40,640 shaftments?
It's about 850,000,000 times as long as a Red Blood Cell
The length of a Red Blood Cell is about 0.0000490 shaftments.
(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 µm (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.