In order for a cell to have the highest rate of diffusion, it needs to have a circular shape with a ratio of 10:1. There are dimples on this cell that end up having a surface area of 1. There needs to be 50% surface area for the villi for this cell in order for it to have highest rate of diffusion. The volume is about 4 in size.
source: http://www.mhhe.com/biosci/genbio/biolink/j_explorations/ch02expl.htm
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