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-domi- t1_ixvobwz wrote

The hydrostatic pressure differential is based on the height of the column. For something as short as a bat, the contribution of hydrostatic pressure to their blood pressure isn't very significant. I.e. whatever musculature is required to keep their circulation tracking appropriately is likely enough to compensate for the hydrostatic differential.

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Hopeful_Anything_257 OP t1_ixyt7hj wrote

This was too complicated for me to understand, explain like I'm two!

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-domi- t1_ixzjbe7 wrote

A 6' human will have something like 2.5 psi more blood pressure at their feet when standing, compared with their head. That's not a lot of pressure, but their blood vessels still need to squeeze a little more when standing to have the same circulation as when laying down. A bat will have less than 0.2 psi of difference upright or laying down (or upside down vs laying down). That's probably not really significant enough to require additional adaptation.

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