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Hopeful_Anything_257 OP t1_ixyt7hj wrote

Reply to comment by -domi- in ELI5: How are bats able to hang upside down for a long periods of time without blood pooling to their heads? by Hopeful_Anything_257

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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